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Sydney Sweeney and Scooter Braun 's relationship is moving pretty fast ... or at least it was last weekend when the two zipped around on a pair of powerful jet skis!

The actress and her music producer beau went for the ride around the Florida Keys with some pals ... each driving their own vehicle -- no romantic ride for couples here. Backgrid

Sweeney put her body on display during the romp ... leaving little to the imagination in a burgundy thong-style bikini. Her uncovered backside definitely drew eyes -- both when she was bent over a jet ski and when she was heading back into her home into what looks like a large gathering.

Scooter threw on a pair of board shorts -- but didn't let a T-shirt mess with the view of his massive biceps. Play v

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