PGA Star Brooks Koepka And Hot Model GF Show Off Bare Butts In Maldives!!!

Move over Jay Cutler and Kristin Cavallari ... there's a new king and queen of the bare-ass game -- Brooks Koepka and his smokin' hot model GF!!!

The PGA star and Jena Sims did their best Cutler-Cavallari impression in Maldives on Tuesday ... flashin' their asses for the camera in some tiny swimwear.

The caption? "Who wore it better??"

So far, Jena's leading the votes ... but it's close -- and yeah, easy to see why!!!

It's been a hell of an offseason for Koepka -- a two-time U.S. Open winner -- the dude's been hoppin' around with Sims in Vegas, Santa Monica, Abu Dhabi and now South Asia.

In fact ... it was a great REGULAR season for the guy too -- remember when Trump congratulated his "powerful mind" AND "powerful game" after winning the PGA Championship in August??

Bottom line ... it's GREAT to be Brooks.