It's all about "bikinis and big booties" .... at least according to the first trailer for "Spring Breakers."

Selena Gomez, Vanessa Hudgens, Ashley Benson and Rachel Korine are good girls gone bad in the movie -- which focuses on four college girls who rob a convenience store so they can afford to go on Spring Break.

They eventually get arrested -- in their skimpy swimwear, naturally -- and James Franco's creepy, Riff Raff/Kevin Federline-like rapper comes to their rescue.

Cue the montage of guns, money, Britney Spears music and threesomes. Yep, threesomes.

Clearly Selena and Vanessa are working on revamping their Disney images with the flick, which looks a lot darker than the fun, party-packed set photos suggested.

The movie is due out later this year. What do you think?

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