Demi Lovato 'Sorry (Not Sorry)' for Knocking Out MMA Trainer's Tooth: 'When's My First Fight?'

Demi Lovato returned to Instagram for the first time in almost two months to post a video of her laughing after punching out MMA trainer Jay Glazer's front tooth.

“Holy shit I literally knocked @jayglazer’s tooth out during training this morning - while he was wearing a mouth piece!!!!" Lovato writes in her Instagram caption. "Hahahahaha sorry (not sorry) Jay!!! So coach, when’s my first fight?! #unbreakableperformance.”

Glazer, a studio analyst for Fox Sports and actor on HBO’s Ballers, is a mixed martial artist and is known to train celebrity friends.

The video has more than 2 million views and features Lovato smiling in boxing gloves as Glazer shows off the tooth she dislodged. The singer hugs him toward the end in a sign of apology for her powerful hands.

Before Tuesday's (March 5) video, Lovato's most recent Instagram photo was from mid-January, sharing two looks as a bridesmaid in Florida for a friend’s wedding.

Watch the full clip below: