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Who knew Stephanie Pratt was such a fan of bunnies? The Hills star stripped down for PETA's Be Nice to Bunnies campaign...hoping to aid in the fight against cruel animal testing.

PETA is on a mission to discourage people from buying personal-care and household products that have been "smeared into rabbits' eyes or force-fed to mice or guinea pigs." The animal rights organization has name Clorox and Unilever as two companies that still test on animals.

Stephanie says, "Guinea pigs and rats and bunnies … [are] blinded, poisoned, and burned for such a useless experiment that's not needed."

We have to say Spencer's lil' sis is looking fab...and all for an incredible cause!