Charli XCX & Sam Smith Turn It Up For iHeartRadio's Jingle Ball 2014 - See The Pics!

Charli XCX changes into her cheerleader uniform once again for the iHeartRadio Jingle Ball 2014, hosted by Z100 New York and presented by Goldfish Puffs at Madison Square Garden on Friday night (December 12) in New York City.

The 22-year-old singer hit up the stage twice — once for her set and again to perform “Fancy” with Iggy Azalea just after performing at the Coca-Cola All Access Lounge at Hammerstein Ballroom

PHOTOS: Check out the latest pics of Charli XCX

Meghan Trainor and Sam Smith also hit the Jingle Ball stage later on in the night.

FYI: Charli is wearing Shellys London shoes.

15+ pics inside of Charli, Meghan and Sam…