Ariana Grande & Big Sean Look Completely In Love on Jingle Ball Stage 2014

Ariana Grande and boyfriend Big Sean keep it hot while performing their song “Best Mistake” at KIIS FM’s Jingle Ball 2014 powered by Line at Staples Center on Friday evening (December 5) in Los Angeles.

The 21-year-old singer performed some of her hits, such as “Problem,”"Love Me Harder” with The Weeknd, and “Break Free.”

PHOTOS: Check out the latest pics of Ariana Grande

Ariana also closed out her set with a show-stopping performance of latest song “Bang Bang” with Jessie J. Watch the video below!

15+ pictures inside of Ariana Grande and Big Sean performing “Best Mistake” at Jingle Ball…