Say it ain’t so!
Selena Gomez got to perform at KIIS FM’s Jingle Ball on Friday night, but it turned out to be a nightmare for the young singer!
Eyewitnesses said that Justin Bieber’s ex was lip-synching when there were sound problems.
Then Selena did the unthinkable and said into a live mic, “What the f*ck!” and ran off stage.
But don’t worry, she came back and apologized to her fans for the sound problem, then did a few more songs.
To hear the very NSFW moment, click 'PLAY'