Poor Demi Lovato most likely isn't regretting her decision to leave the 'X Factor' now.

On last night's finale (Dec. 19), the show decided to make a gag reel of Demi drinking a mysterious beverage throughout the season. And she was none too happy about it, considering her past alcohol problems.

When the joke ended, it revealed the substance was just "Annoying Juice," but it didn't make it any less funny. Especially when the camera showed Demi's hurt face.