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Kristin Cavallari Teeny Bikini Booze Cruise ... With Jay Cutler

It was booze, butts and boats for Kristin Cavallari and Jay Cutler on their Mexican vacation ... with the two stars partying their asses off on a yacht with a gang of friends.

The Cutlers were in Mexico to celebrate Kristin's 30th birthday ... but the highlight was a booze cruise on a boat called the "Blue Guru" with celeb hairstylist Scotty Cunha.

Guessing Cutler paid for the excursion since he reportedly made $16 mil this year.

Not bad for a guy who didn't make the playoffs.

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