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

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No wonder he's so in love with her!

Amal Clooney is nearing the end of her pregnancy with twins, but she still found time to orchestrate a surprise birthday for her famous husband George! The human rights lawyer planned a secret joint celebration for her hubby and his pal and business partner Rande Gerber, and she even got them a Casamigos cake, fashioned after their tequila company.

The 39-year-old flew Gerber and his supermodel wife Cindy Crawford out to London in secret, and the whole group spent the weekend relaxing.

"Amal set it all up, and Rande and Cindy surprised George when he got home Saturday," a source dished to E! News. When George pulled into his driveway, Rande "came from around the bushes driving George's lawnmower and pulled up beside George's car while Cindy was nearby in the garden cutting fresh flowers. George was totally surprised!"

"Amal made it a joint birthday celebration, since Rande's birthday was just a couple of weeks ago. George had the best time celebrating his birthday with his best friends, and he was genuinely surprised. Rande and Cindy are proud they were able to keep the secret!" the source added.

Among their activities? Boating down the River Thames!

It won't be long before the former bachelor becomes a daddy, so we hope he enjoyed his last days of kid-free freedom!

"Amal is due any day now. They're just waiting at this point. Technically her due date is next month, but they expect the twins to come early. It's just a waiting game now," the source revealed.

We wish we were part of this glamorous squad!