Don't mess with Demi Lovato who is taking her jiu-jitsu training very seriously! The pop star even knocked out her trainer’s front tooth!
The 26-year old singer looked "shookt" as her trainer Jay Glazer rang the gym bell to announce that his tooth was knocked out after she packed a hard punch. “Holy shit I literally knocked @jayglazer’s tooth out during training this morning - while he was wearing a mouth piece,” wrote Demi on Instagram. “Hahahahaha sorry (not sorry) Jay!!! So coach, when’s my first fight?!”