Demi Lovato is such a freaking badass. After knocking out THE Sylvester Stallone in the boxing ring, Lovato has proved she knows how to throw a punch. And, in an Instagram post on Tuesday, the fit, Fabletics star slipped on her boxing gloves once again — and accidentally punched out her trainer's tooth! "Holy sh*t I literally knocked @jayglazer's tooth out during training this morning — while he was wearing a mouth piece!!!!" Lovato captioned the video. "Hahahahaha sorry (not sorry) Jay!!!
