George Clooney celebrated his engagement to Amal Alamuddin by partying with Bono and Cindy Crawford on Sunday (11May14).

The Hollywood actor popped the question to British lawyer Alamuddin last month (Apr14) and the couple reportedly marked the upcoming nuptials by joining celebrity pals for dinner at supermodel Crawford's restaurant in Malibu, California.

Crawford and her husband Rande Gerber were pictured arriving at Mexican eaterie Cafe Habana bearing flowers, while U2 rocker Bono tried to keep his appearance under wraps by wearing a hat and sunglasses.

A source tells E! News, "People got a show they didn't expect and other (patrons) said it was the best Mother's Day ever."

The soon-to-be-wed couple dressed casually for the celebration, but all eyes were Alamuddin's seven-carat diamond and platinum engagement ring, which is reportedly worth $720,000 (£450,000).

Clooney and Alamuddin met at a fundraising event last year (13).