Selena Gomez & Cara Delevingne are Saint-Tropez Bikini Babes!

Selena Gomez flaunts her cute retro bikini while celebrating her birthday week on billionaire Alshair Fiyaz‘s new boat Ecstasea on Monday (July 21) in Saint-Tropez, France.

The now 22-year-old actress/singer- was joined by a group of girl friends, including Cara Delevingne. Happy birthday, Selena!

PHOTOS: Check out the latest pics of Selena Gomez

Earlier that day, Selena and Cara were spotted taking a helicopter ride together before boarding the boat. Looks like they’re having an awesome vacay!

15+ pictures inside of Selena Gomez and Cara Delevinge hanging out on a yacht together…