Amal and George Clooney Buy the Kitchen Staff Tequila During a Belated Birthday Celebration in L.A.

The tequila was flowing at the Sunset Tower Bar in Los Angeles during a celebration for Amal Clooney.

The human rights lawyer, who turned 38 last Wednesday, partied on Friday with her husband George Clooney, 52, and the couple's close friends Rande Gerber and Cindy Crawford.

The four friends appeared to be "having a blast," according to an onlooker, as they drank Casamigos tequila – the brand owned by Clooney, Gerber and Mike Meldman.

The onlooker says the couple even stayed for dessert at the Sunset Boulevard hotspot.



After they filled out the dessert menu, they checked the box at the bottom that says, "Buy the kitchen a six pack of beer."

Apparently, they crossed out "six pack of beer" and wrote "bottle of Casamigos" instead.

It's been a busy week for the Clooneys as Amal flew to Los Angeles last weekend to join her husband on the red carpet for the premiere of his latest movie, Hail Caeser.

Also last week, George revealed in an interview on The Ellen DeGeneres Show that his proposal to Amal went horribly because she didn't realize he was popping the question.

"I've got it all set up, timed out and the song is coming and she gets up to go wash the dishes, which she's never done," George explained. "And I'm like, 'What are you doing?' and she comes back in. And finally I said, 'Ya know, I blew out the candle' and I said, 'I think the lighter's in the box behind you.' And she reaches around and she pulls out the box and I've got just the ring sitting in there and she pulls it out and she looks at it and she's like, 'It's a ring' – like as if somebody had left it there some other time."