Combined net worth: $65 billion
Warren Buffett separated from his first wife, Susan, in 1977 and it just so happened to be Susan who introduced Buffett to Astrid Menks. The three were friends until Susan's death in 2004 and have were even known to send gifts signed "Warren, Susie, and Astrid."
Astrid was a waitress at a cocktail bar before marrying Buffett, the famous investor and chairman/CEO of Berkshire Hathaway. Buffett's company owns Geico, Dairy Queen, Fruit of the Loom, Helzberg Diamonds, and Heinz, among others, and has a minority stake in American Express, Coca-Cola, Goldman Sachs, and more.
Buffett partnered with Bill Gates to create The Giving Pledge, and encourage other billionaires to commit most of their wealth to charity; the Buffetts personally plan to give away 85% of their Berkshire Hathaway shares.
Source: Wealth-X