It looks like we learned something new about Selena Gomez. It seems like Justin Bieber's ex-girlfriend is a fan of dropping the F-bomb when she becomes annoyed.

According to Hollywood Life, when the "Slow Down" singer came across some serious sound issues while performing at Jingle Ball in Los Angeles on December 6th.

Not only did her microphone cut out and reveal that she was lip-syncing, it turned back on in time to catch her yelling a profanity out of frustration in front of 20,000 fans in attendance.

Selena Gomez seem to become angered when she ripped out her in-ear monitors which allow performers to hear themselves sing and tried to continue on without them.

Unfortunately she failed and a fan revealed to the celebrity gossip site that the singer went from "visibly angry to verbally angry." The starlet's microphone then went live and she could be heard clearly yelling, "What the f**k?"

As it became clear that she could not go on with the show until her backing tracks were fixed, the stage went dark and the songstress briefly walked off.

When she returned, Selena Gomez apologized to the fans for the "sound issues," and promised to play two more songs.

However, the "Spring Breakers" star didn't keep her word seeing as after her rendition of "Come & Get It," featured the track playing every though Gomez took the mic away from her mouth.

Eventually the brunette ran off stage and did not return.

Check out some of her performance in the video below.