The 19-year-old singer and actress showed off her killer abs in a cropped top as she was joined at the event by fellow performers Charlie Puth, Meghan Trainor, Lukas Graham, Daya, and Alessia Cara.

Other performances during the night included sets by the Backstreet Boys, The Chainsmokers, and Fifth Harmony.

The next Jingle Ball tour stop is at San Jose, Calif on December 1 with musical guests including Diplo and Niall Horan.