Selfies? So last year. These days, celebrities are all about the belfie, the "butt selfie." And what better place to shamelessly show off your assets than at the gym? Mariah Carey, Khloé Kardashian, and Demi Lovato are all guilty of using their #fitnessgoals as an excuse for some serious belfie action.
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Click through the gallery to see celebrities flaunting their butts in their gym selfies.