Jayme Deerwester

USA TODAY

George Clooney's bachelorhood used to be one of the few things you could count on in Hollywood.

Not so much anymore.

People and US Weekly are reporting that the the Oscar winner, 52, is engaged to British human rights lawyer Amal Alamuddin, 36, whom he began dating last fall. They've been spotted together in London, New York, Tanzania and the Seychelles.

Onlookers noticed a giant rock on Alamuddin's left ring finger when the two met Cindy Crawford and husband Rande Gerber for dinner Thursday in Malibu, Calif.

Alamuddin, who was born in Beirut, studied at Oxford and NYU and is fluent in three languages, is his first non-Hollywood partner in recent memory; however, her background in international law and human rights means she still has plenty in common with Clooney, who has long been an advocate for refugees in Darfur.

Clooney's publicist, Stan Rosenfield, is staying mum, issuing a one-line response: "I don't comment on my client's personal life."

Clooney has been married once before, to actress Talia Balsam, from 1989 to 1993, which was just before he was cast in a hit show (NBC's ER) and reached A-list status.

After that, he converted to a serial monogamist, dating a string of women every couple of years, most recently Italian actress Elisabetta Canalis (2009-2011) and former WWE personality Stacy Keibler (2011-2013). Keibler just announced her marriage to businessman Jared Pobre in March; the couple are expecting their first child.