Charli XCX Flashes Butt Cheeks on Stage at Jingle Ball in Florida

Were you looking at my bum? "I don't care!"

Charli XCX, known for her popular single "Boom Clap" and her collaboration with rapper Iggy Azalea on the summer hit "Fancy," got cheeky while performing on stage this week at the 93.3 FLZ radio station's 2014 Jingle Ball, sponsored by iHeartRadio, at Amalie Arena in Tampa, Florida, just before Christmas.

The 22-year-old British singer, who wore a black cheerleading uniform-style outfit, complete with a short skater skirt and black top with the word "Sucker" printed on it, at one point had a wardrobe malfunction; she flashed her butt cheeks to the crowd.

No, she didn't go commando--the pop star wore what appeared to be a black thong. And she did not appear fazed by the wardrobe malfunction during her set, during which she danced, did some serious '80s-style head-banging and jumped around on stage vigorously.

Also earlier this month, at the 2014 Billboard Women In Music Luncheon at Cipriani Wall Street in New York City, Charli XCX showed off a look that was one step away from becoming a wardrobe malfunction; the singer sported a semi-sheer, gown that showed off, well, many of her assets (see the pic).

At the Jingle Ball concert in Tampa, Charli XCX sang "Boom Clap," "Break the Rules" as well as the hit single "I Love It," her 2012 collaboration with Swedish synthpop duo Icona Pop.

Other performers at the Jingle Ball in Tampa included Demi Lovato, Nick Jonas, Calvin Harris, Pharrell Williams, Jason Derulo and "All About That Bass" singer Meghan Trainor.

Earlier this month, Charli XCX also performed at previous Jingle Balls in other cities, such as in New York City, Boston and Washington D.C.