Slow Down singer Selena Gomez cursed and walked off stage at the KIIS-FM Jingle Ball concert in Los Angeles on Friday, Dec. 6 after problems with her sound.

The 21-year-old said the F-word and stormed off in annoyance before finishing her set.

"Sorry, the sound isn't working!" Gomez was heard yelling to the crowd, Us Weekly reported. "Are you guys having a good night? I promise, a lot cooler people are gonna come out tonight."

"Is it okay if I perform two more songs and you guys can get to it?" she asked the crowd, filled with mostly children.

The performance continued to have sound problems and she said to the audience, "I have to thank you guys so much for allowing me to be able to perform the music that I love.

"And I have to say that before you guys go on to the people that you care about, I really appreciate you supporting everything that I do. So this next song is the first song I had hit No. 1, and it's called Come & Get It," she reportedly said.

After that she left before completing her set. An onlooker told the magazine Gomez was "pissed."

The former Disney star has not addressed the incident and made no mention of it on her Twitter or Instagram accounts. The performance took place while Gomez is on hiatus from her Stars Dance world tour, which will resume Jan. 16 in Tokyo.

Watch a fan's video of Gomez performance below. (Warning: explicit language)

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Selena Gomez