Charli XCX took on a charismatic performance of the big hit "Boom Clap" that connected with "Break the Rules."

The Fault in Our Stars actor Ansel Elgort introduced the singer where pink balloons spread across the stage and a giant group of stars spread all over. Born as Charlotte Emma Aitchison, the 22-year-old sported a white dress with sunglasses giving off a Katy Perry type of style.

Check out the performance below.