• Net worth: $65 billion

Famed billionaire investor Warren Buffett married his second wife Astrid Menks in 2006, two years after the death of his first wife Susan Buffett.

Around the time of their nuptials, Buffett's daughter Susie Buffett reportedly told the New York Times that she was thankful they were together.

"She loves him and takes care of him. If Warren didn't have a cent, she'd be with him," she told the newspaper.

Related: Warren Buffett in 90 seconds

Buffett made his billions investing in other companies through his holding company, Berkshire Hathaway (BRKA), where the 84-year-old remains CEO. His firm owns large stakes in firms such as American Express (AXP), Coca-Cola (KO), Goldman Sachs (GS) and IBM (IBM).

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