May 13, 2014 - 12:14 BST hellomagazine.com Double celebrations as George Clooney and Amal Alamuddin toast engagement at Bono's star-studded birthday party George Clooney and Amal Alamuddin arrived hand-in-hand for a star-studded party in Malibu on Sunday to celebrate Bono's birthday and their recent engagement. The happy couple were pictured arriving at Cafe Habana, where they joined the likes of Cindy Crawford, her husband Rande Gerber, who owns the restaurant, and U2's The Edge. The celebrity group gathered on the back patio, where they toasted George and Amal with tequila and wine. George Clooney and fiancée Amal Alamuddin were spotted together at Bono's birthday bash"After the toast, George and his fiancée were all over each other," a source told People. "Lots of hugging." Smiling Amal could be seen showing off her impressive seven-carat diamond engagement ring as she chatted with her husband-to-be's close friends. There was even a bit of karaoke; Bono got up and sang during the party, as did supermodel Cindy, who reportedly duetted with her daughter Kaia. Rande Gerber and Cindy Crawford were also seen at the party An eyewitness told E! News that the venue was busy with people celebrating Mother's Day. "They got a show they didn't expect and other (restaurant patrons) said it was the best Mother's Day ever." George, 53, proposed to British human rights lawyer Amal, 36, in late April, after seven months of dating. The future Mr and Mrs Clooney recently returned from a holiday in Cabo, Mexico, where they celebrated a friend's wedding. "You can tell these two are in love," an onlooker said.