Bikinis, Boats & Besties: Kendall Jenner & Bella Hadid Party at Sea for Hailey Baldwin's 21st Birthday

Hailey Baldwin at #RevolveAwards
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The model continued her birthday celebrations with some fun in the sun, Caribbean-style!

All aboard for Hailey Baldwin’s Caribbean birthday bash!

The model and Drop the Mic host headed away for a fun-filled tropical getaway to mark her 21st birthday, and her gorgeous celeb besties were along for the fun.

Runway pals Kendall Jenner and Bella Hadid shared stunning snaps from the picturesque trip on social media on Monday.

While Jenner slipped into a black one-piece and posed on a boat with the group, Hadid flaunted her incredible body while lounging against a log in the ocean wearing a tiny black bikini.

Meanwhile, the birthday girl -- who is the daughter of actor Stephen Baldwin -- pulled a sultry pose while relaxing on the beach wearing a navy two-piece and gold hoop earrings.

The vacay comes after Baldwin marked her actual birthday in New York City on Wednesday with around 30 guests, including Jenner. The bash took place at Japanese restaurant Zuma, where an omakase-style feast was served.

"When the clock struck midnight, she was surprised with a personalized cake and everyone sang 'Happy Birthday,'" a source told ET.