Singer Chaka Khan enters rehab

Updated 0711 GMT (1511 HKT) July 11, 2016

After <strong>Chris Brown</strong> violated his probation in 2013, we were intrigued when <a href="http://www.cnn.com/2014/02/03/showbiz/chris-brown-probation-hearing/index.html?iref=allsearch" target="_blank">a judge sent him off to rehab</a> instead of jail to deal with his anger problems as well as drug abuse.

Photos: Surprising celebrity rehab stays

After Chris Brown violated his probation in 2013, we were intrigued when a judge sent him off to rehab instead of jail to deal with his anger problems as well as drug abuse.

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Photos: Surprising celebrity rehab stays

Probably one of the most-used words in Hollywood -- aside from "scandal" -- is "rehab." It seems nearly every celebrity has sought treatment at one point or another, although reasons can vary from substance abuse to mental health to simply "undisclosed." Singer Chaka Khan entered rehab for "a dependence on prescription pain medications," according to her website.

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"Brooklyn Nine-Nine" actor <strong>Terry Crews</strong> has admitted in a series of Facebook videos that he has sought treatment for a porn addiction that "messed up my life."

Photos: Surprising celebrity rehab stays

"Brooklyn Nine-Nine" actor Terry Crews has admitted in a series of Facebook videos that he has sought treatment for a porn addiction that "messed up my life."

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A representative for actress <strong>Hayden Panettiere</strong> revealed she had entered a treatment facility to combat postpartum depression, a condition she'd spoken openly about since the birth of her daughter in December 2014.

Photos: Surprising celebrity rehab stays

A representative for actress Hayden Panettiere revealed she had entered a treatment facility to combat postpartum depression, a condition she'd spoken openly about since the birth of her daughter in December 2014.

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TMZ reported that <strong>Jon Hamm</strong> of AMC's "Mad Men," shown here on NBC's "Today" show, completed a 30-day stint in rehab to treat an addiction to alcohol.

Photos: Surprising celebrity rehab stays

TMZ reported that Jon Hamm of AMC's "Mad Men," shown here on NBC's "Today" show, completed a 30-day stint in rehab to treat an addiction to alcohol.

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<strong>Selena Gomez's </strong><a href="http://www.people.com/people/article/0,,20783560,00.html" target="_blank">rep confirmed</a> that the 21-year-old voluntarily had a two-week stay at an Arizona-based rehab center in January 2014. The rep wouldn't say what she needed treatment for, just that it didn't have anything to do with drugs or alcohol.

Photos: Surprising celebrity rehab stays

Selena Gomez's rep confirmed that the 21-year-old voluntarily had a two-week stay at an Arizona-based rehab center in January 2014. The rep wouldn't say what she needed treatment for, just that it didn't have anything to do with drugs or alcohol.

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MTV's "Total Request Live" may be a distant memory, but <strong>Mariah Carey's</strong> bizarre 2001 appearance on the program can't be forgotten. That year, Carey rolled onto the "TRL" set wheeling an ice-cream cart and wearing an oversized T-shirt, taking host Carson Daly completely by surpise. After the awkward interview -- during which Daly repeatedly asked her, "What are you doing?!" -- Carey went into rehab for what was initially described as an emotional and physical breakdown. The <a href="http://abcnews.go.com/GMA/story?id=125557" target="_blank">singer later clarified</a> that the only thing that was wrong with her was exhaustion.

Photos: Surprising celebrity rehab stays

MTV's "Total Request Live" may be a distant memory, but Mariah Carey's bizarre 2001 appearance on the program can't be forgotten. That year, Carey rolled onto the "TRL" set wheeling an ice-cream cart and wearing an oversized T-shirt, taking host Carson Daly completely by surpise. After the awkward interview -- during which Daly repeatedly asked her, "What are you doing?!" -- Carey went into rehab for what was initially described as an emotional and physical breakdown. The singer later clarified that the only thing that was wrong with her was exhaustion.

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After announcing her split from Ashton Kutcher in November 2011, <strong>Demi Moore</strong> was under such stress that she pulled out of a film project and went to rehab the next January. "Demi has chosen to seek professional assistance to treat her exhaustion and improve her overall health," <a href="http://marquee.blogs.cnn.com/2012/01/25/demi-moore-seeks-treatment-drops-out-of-lovelace/?iref=allsearch" target="_blank">her rep said at the time. </a>

Photos: Surprising celebrity rehab stays

After announcing her split from Ashton Kutcher in November 2011, Demi Moore was under such stress that she pulled out of a film project and went to rehab the next January. "Demi has chosen to seek professional assistance to treat her exhaustion and improve her overall health," her rep said at the time.

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<strong>Britney Spears'</strong> stint in rehab is now among the most famous, so it might be hard to consider this "surprising." But remember that, at the time, Spears' behavior was much more erratic, and the only thing that was certain was that she was going through some things. Before she "voluntarily checked herself into an undisclosed rehab facility" in 2007, Spears reportedly checked into Eric Clapton's Crossroads treatment facility in Antigua but left after just a day, headed to Florida and then infamously shaved her head.

Photos: Surprising celebrity rehab stays

Britney Spears' stint in rehab is now among the most famous, so it might be hard to consider this "surprising." But remember that, at the time, Spears' behavior was much more erratic, and the only thing that was certain was that she was going through some things. Before she "voluntarily checked herself into an undisclosed rehab facility" in 2007, Spears reportedly checked into Eric Clapton's Crossroads treatment facility in Antigua but left after just a day, headed to Florida and then infamously shaved her head.

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It's unclear whether <a href="http://www.cnn.com/2014/01/23/showbiz/dean-mcdermott-rehab/" target="_blank"><strong>Dean McDermott</strong></a> was trying to address the rumors that he'd cheated on wife Tori Spelling when he announced that he was going to rehab in January 2014 or if that was just unfortunate timing. Either way, <a href="http://www.tmz.com/2014/01/23/dean-mcdermott-rehab-treatment-tori-spelling-cheating/" target="_blank">the reality star and actor has said</a> that he's seeking help for "some health and personal issues" and that he's "truly sorry for the mistakes I have made and for the pain I've caused my family."

Photos: Surprising celebrity rehab stays

It's unclear whether Dean McDermott was trying to address the rumors that he'd cheated on wife Tori Spelling when he announced that he was going to rehab in January 2014 or if that was just unfortunate timing. Either way, the reality star and actor has said that he's seeking help for "some health and personal issues" and that he's "truly sorry for the mistakes I have made and for the pain I've caused my family."

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In 2012, singer <strong>LeAnn Rimes</strong> <a href="http://marquee.blogs.cnn.com/2012/10/24/leann-rimes-talks-treatment-on-katie/?iref=allsearch" target="_blank">voluntarily entered a treatment program to deal with stress and anxiety</a> after enduring nonstop scrutiny for her marriage to Eddie Cibrian.

Photos: Surprising celebrity rehab stays

In 2012, singer LeAnn Rimes voluntarily entered a treatment program to deal with stress and anxiety after enduring nonstop scrutiny for her marriage to Eddie Cibrian.

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When no one was looking, <strong>Zac Efron</strong> slipped into rehab in 2013 to receive treatment for undisclosed reasons. By January 2014, <a href="http://marquee.blogs.cnn.com/2014/01/21/zac-efron-on-life-post-rehab-never-happier/?iref=allsearch" target="_blank">Efron said he was feeling like a new man. </a>

Photos: Surprising celebrity rehab stays

When no one was looking, Zac Efron slipped into rehab in 2013 to receive treatment for undisclosed reasons. By January 2014, Efron said he was feeling like a new man.

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In January 2014, singer <strong>Ke</strong> announced that she was seeking treatment for an eating disorder <a href="http://www.cnn.com/2014/02/04/showbiz/kesha-treatment-eating-disorder/index.html" target="_blank">and canceled</a> upcoming concert stops in order to stay on track.

Photos: Surprising celebrity rehab stays

In January 2014, singer Ke$ha announced that she was seeking treatment for an eating disorder and canceled upcoming concert stops in order to stay on track.

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In December 2013, <a href="http://www.cnn.com/2013/12/10/showbiz/adam-shankman-rehab/" target="_blank">director<strong> Adam Shankman</strong></a> was admitted into an undisclosed rehab facility for an undisclosed reason. <a href="http://www.usmagazine.com/celebrity-news/news/adam-shankman-checks-into-rehab-seeking-treatment-2013912" target="_blank">The only thing his rep would say</a> is that the "Hairspray" director's family and friends "support him and wish him well on his journey to recovery."

Photos: Surprising celebrity rehab stays

In December 2013, director Adam Shankman was admitted into an undisclosed rehab facility for an undisclosed reason. The only thing his rep would say is that the "Hairspray" director's family and friends "support him and wish him well on his journey to recovery."

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<strong>Demi Lovato</strong> has been open about her substance abuse, but when she first sought help in 2010, <a href="http://marquee.blogs.cnn.com/2010/11/02/lovatos-reps-make-it-clear-shes-not-in-rehab/?iref=allsearch" target="_blank">her reps made it very clear</a> that she was "in a treatment center" for <a href="http://www.cnn.com/2010/SHOWBIZ/celebrity.news.gossip/11/02/demi.lovato.treatment/index.html?section=cnn_latest" target="_blank">"emotional and physical issues."</a>

Photos: Surprising celebrity rehab stays

Demi Lovato has been open about her substance abuse, but when she first sought help in 2010, her reps made it very clear that she was "in a treatment center" for "emotional and physical issues."

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<strong>Heather Locklear</strong> has entered rehab for both substance abuse and psychological issues. <a href="http://www.people.com/people/article/0,,20208453,00.html" target="_blank">In 2008, she headed for an Arizona treatment facility</a> to contend with anxiety and depression and <a href="http://www.people.com/people/article/0,,20564886,00.html" target="_blank">sought care again in 2012</a>, although her reps said it was not an inpatient program.

Photos: Surprising celebrity rehab stays

Heather Locklear has entered rehab for both substance abuse and psychological issues. In 2008, she headed for an Arizona treatment facility to contend with anxiety and depression and sought care again in 2012, although her reps said it was not an inpatient program.

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<strong>David Duchovny</strong> admitted entering rehab for sex addiction in 2008, saying in a statement at the time that he "voluntarily entered a facility for ... treatment." Interestingly, he was simultaneously portraying a womanizing writer on Showtime's "Californication."

Photos: Surprising celebrity rehab stays

David Duchovny admitted entering rehab for sex addiction in 2008, saying in a statement at the time that he "voluntarily entered a facility for ... treatment." Interestingly, he was simultaneously portraying a womanizing writer on Showtime's "Californication."

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<strong>Eva Mendes'</strong> 2008 trip to rehab caught many off-guard, and what was even more puzzling was the lack of clarity about what she was seeking treatment for. Mendes' silence led to plenty of theories, many of which involved allegations of substance abuse, but the actress brushed them off. "There are so many lies out there regarding my recent trip to Cirque Lodge," she told Interview magazine in 2008. "But I don't care what people think. I just don't care. So I will neither confirm nor deny."

Photos: Surprising celebrity rehab stays

Eva Mendes' 2008 trip to rehab caught many off-guard, and what was even more puzzling was the lack of clarity about what she was seeking treatment for. Mendes' silence led to plenty of theories, many of which involved allegations of substance abuse, but the actress brushed them off. "There are so many lies out there regarding my recent trip to Cirque Lodge," she told Interview magazine in 2008. "But I don't care what people think. I just don't care. So I will neither confirm nor deny."

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Like fellow actress Eva Mendes, <strong>Kirsten Dunst </strong>spent part of 2008 seeking treatment at Utah's Cirque Lodge facility. At the time, it was speculated that Dunst's stay was prompted by too much partying, but the actress later said that she was suffering from depression.

Photos: Surprising celebrity rehab stays

Like fellow actress Eva Mendes, Kirsten Dunst spent part of 2008 seeking treatment at Utah's Cirque Lodge facility. At the time, it was speculated that Dunst's stay was prompted by too much partying, but the actress later said that she was suffering from depression.

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In 2004, amid gossip about her frighteningly frail physique, <strong>Mary-Kate Olsen</strong> checked into an undisclosed rehab facility to seek treatment for an eating disorder. "This is a challenge that Mary-Kate has made a decision to face," her rep told People magazine at the time. "This is a challenge she will meet."

Photos: Surprising celebrity rehab stays

In 2004, amid gossip about her frighteningly frail physique, Mary-Kate Olsen checked into an undisclosed rehab facility to seek treatment for an eating disorder. "This is a challenge that Mary-Kate has made a decision to face," her rep told People magazine at the time. "This is a challenge she will meet."

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<strong>Tiger Woods</strong> declined to say why he spent 45 days in rehab around the start of 2010, but given his admission to having multiple extramarital affairs, it wasn't long before the public tried to fill in the blanks. Woods, however, <a href="http://www.cnn.com/2010/US/04/05/tiger.woods.returns/index.html?iref=allsearch" target="_blank">said that he went to rehab</a> "to take a hard look at myself. And I did, and I've come out better."

Photos: Surprising celebrity rehab stays

Tiger Woods declined to say why he spent 45 days in rehab around the start of 2010, but given his admission to having multiple extramarital affairs, it wasn't long before the public tried to fill in the blanks. Woods, however, said that he went to rehab "to take a hard look at myself. And I did, and I've come out better."

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In 2011, "American Pie" star <strong>Seann William Scott</strong> checked himself into rehab to confront "health and personal issues." His 30-day stay didn't change his sense of humor, though: he later joked with the UK's Independent that he'd been addicted to watching his own movies. "Have you ever seen 'The Dukes of Hazzard'?" <a href="http://blogs.independent.co.uk/2012/05/02/seann-william-scott-were-just-trying-to-make-people-laugh/" target="_blank">he said</a>. "Don't, it's f*****g terrible."

Photos: Surprising celebrity rehab stays

In 2011, "American Pie" star Seann William Scott checked himself into rehab to confront "health and personal issues." His 30-day stay didn't change his sense of humor, though: he later joked with the UK's Independent that he'd been addicted to watching his own movies. "Have you ever seen 'The Dukes of Hazzard'?" he said. "Don't, it's f*****g terrible."

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(CNN)Grammy award winning R&B singer Chaka Khan is canceling her July performances in order to focus on her health, according to her website.

The 63-year-old singer will enter into a drug rehabilitation program.

"Chaka has struggled with a dependence on prescription pain medications and has voluntarily entered the program to get healthy and stay that way," a message to fans on Khan's website said Sunday.

She became a household name and was propelled to stardom from the song "I Feel For You," written and first performed by Prince.

Khan is expected to perform in Atlanta; Atlantic City, New Jersey; Grand Prairie, Texas; and St. Louis starting August 5.

She should be back with a microphone in her hands very soon, as "doctors have urged her to resume recording mid-July and commence all performances beginning August 1st and onward," the statement said.

CNN has reached out to Khan's publicist for more information.