Penampilan Ariana Grande dengan tanduk rusa di acara iHeartRadio Jingle Ball 2014, di Madison Square Garden New York City, 12 Desember 2014. Mike Coppola/Getty Images for iHeartMedia

Aksi panggung Ariana Grande saat tampil di acara iHeartRadio Jingle Ball 2014, di Madison Square Garden New York City, 12 Desember 2014. Kevin Kane/Getty Images for iHeartMedia

Ariana Grande menghibur penonton di acara iHeartRadio Jingle Ball 2014, di Madison Square Garden New York City, 12 Desember 2014. Dimitrios Kambouris/Getty Images for iHeartMedia

Ariana Grande menari bersama penari latar di acara iHeartRadio Jingle Ball 2014, di Madison Square Garden New York City, 12 Desember 2014. REUTERS/Andrew Kelly

Ariana Grande tampil dalam acara iHeartRadio Jingle Ball 2014, di Madison Square Garden New York City, 12 Desember 2014. Kevin Kane/Getty Images for iHeartMedia