Celebrating our Birthdays @casamigos style. Thanks for the cool cake Amal. #houseoffriends

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It was a happy 56th birthday for George Clooney and 55th for Cindy Crawford's hubby Rande Gerber this weekend!

The actor and his pals celebrated in style at the London country estate he shares with wife Amal, as Cindy and Rande joined the pair for the weekend.

Amal had a custom cake made for her the men, recreating the bar they had in their Cabo San Lucas compound, honoring their tequila brand, Casamigos. The group enjoyed time on the River Thames which flows through the couple's property -- it looks like Clooney had an Italian Riva boat imported to his northern European home to make it feel a touch like his Lake Como property.

We caught up with Cindy and Rande as they return to LA on Monday and you'll never guess who went unnoticed behind them at LAX ... click through to find out!

We can always count on him for the photobomb.

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