December 9th, 2013
03:38 PM ET
If you want to steer clear of Selena Gomez's bad side, don't "F" with her audio.
The 21-year-old singer let the "F"-bomb slip during her performance at the 2013 Jingle Ball in Los Angeles Friday, as she was apparently aggravated by a faulty sound system.
Gomez reportedly apologized afterward, explaining to the crowd that the sound wasn't working and offering to perform a few more songs. However, reports suggest that she ended up deciding to just leave the stage early.
Meanwhile, Miley Cyrus twerked on a Santa and debuted a new, bobbed hairstyle - but, for once, it's not the "Bangerz" star who stole the show.
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