Talk about living the sweet life!
Even Zayn Malik was in attendance.
The singer opened up about the experience on Instagram.
The girls had the cutest reaction!
The pop star told Elvis Duran what it was like going back to her stage roots.
We know how to do festivity
He did one hell of a job closing out the concert!
The Chainsmokers brought Madison Square Garden down!
Niall gives us a few hints about what's coming next in his career.
Ari performed songs from her 2015 holiday EP 'Christmas & Chill'
The Z100 and Coca Cola All Access Lounge was the place to be.
You can't go wrong with one piano man and four hits
Niall performed his single 'This Town' during iHeartRadio Jingle Ball in NYC
Ellie Goulding is our second favorite Brit...only after Bridget, duh.
Tinashe, Daya, Rita Ora, Jake Miller, Charlie Puth and Sabrina Carpenter also performed
The model was spotted at Madison Square Garden.