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Ariana Grande Radio

Ariana Grande performed at the iHeartRadio Jingle Ball hosted by Z100 in New York City, and turned Madison Square Garden into her own Grande Winter Wonderland. First of all, instead of her signature cat ears ... she rocked reindeer antlers! 

Her dancers were dressed like they just arrived from Santa's Workshop in the North Pole.

Ariana performed her new Christmas single "Santa Tell Me," and her hits "Problem," "Break Free," and "Love Me Harder."

Photo: Todd Owyoung for iHeartRadio