Bonnie McKee & Austin Mahone: Power 96.1's Jingle Ball 2013!

Bonnie McKee and Austin Mahone get together for a photograph backstage at Power 96.1′s Jingle Ball 2013 held at Philips Arena on Wednesday (December 11) in Atlanta, Ga.

The 29-year-old singer-songwriter and Austin, 17, were joined at the show by their fellow performers Robin Thicke, Flo Rida, Armin van Buuren, Travie McCoy, and the girls of Fifth Harmony.

PHOTOS: Check out the latest pics of Bonnie McKee

“HOLY SH*T I JUST PLAYED JINGLE BALL! ATL U WERE AMAZING!,” Bonnie wrote on her Twitter account. “Thank u so much @poweratl #power961jingleball @iheartradio 4 givin me my 1st arena!”

20+ pictures inside of Bonnie McKee, Austin Mahone, and others at the Power 96.1′s Jingle Ball…