Warren Buffett, the American billionaire who recently freed himself of some of his worldly goods in a well-publicized donation to the Bill and Melinda Gates Foundation, has taken another big step: He’s tied the knot with longtime live-in Latvian girlfriend Astrid Menks.

The two married in Omaha, Neb., on Aug. 30, the billionaire’s birthday. Buffett just turned 76, while Menks is 60, according to a story in the Omaha World-Herald.

Susan Buffet, who died in 2004, left her husband in 1977 but never divorced him. Menks, who was born in Latvia, was hand-picked by Susan to be the businessman’s girlfriend. At the time, Menks was working as a waitress in Omaha. All three remained friends.

Buffett is CEO of Nebraska-based Berkshire Hathaway Inc.