Ariana Grande: Z100 Jingle Ball 2013

Ariana Grande is wonderful in white on stage at the 2013 Z100 Jingle Ball held at Madison Square Garden on Friday night (December 13) in New York City.

“Just performed at Madison Square Garden.. pretended I was in my grandparents living room. Literally can’t believe that just happened!” the 20-year-old actress/singer tweeted afterwards.

PHOTOS: Check out the latest pics of Ariana Grande

Backstage, Ariana opened up about her whirlwind year.

“I do want to challenge myself to go above and beyond,” she shared. “I think I’m just gonna be awkward my whole life!”

25+ pics inside…