According to StarPulse.com, the singer was visibly upset over technical difficulties during her set, when her microphone failed several times . "Sorry, the sound isn't working!" she told the crowd. "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?"
But things still didn't go well with the sound and Selena was even heard dropping an f-bomb at one point, shouting, "What the f***?" after one song finished and the arena went dark. Her microphone worked just fine at that moment .
Miley Cyrus also performed and twerked with Santa Claus, natch.
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This year's official charity for KIIS FM's Jingle Ball 2013 Presented by T-Mobile & Samsung was the Ryan Seacrest Foundation - $1.00 of each ticket sold will be donated to the non-profit organization, which is dedicated to inspiring today's youth through entertainment and education focused initiatives.