Justin Bieber: Power 96.1's Jingle Ball 2012 with Ludacris!

Justin Bieber hits the stage at Power 96.1′s 2012 Jingle Ball at the Philips Arena on Wednesday (December 12) in Atlanta, Ga.

The 18-year-old entertainer brought surprise guest Ludacris to join him on stage for his hit song “Baby.”

“that was fun ATL. always good to be back here. thank u to big bro @Ludacris for coming out on stage tonight. it got LOUD! haha. #MUCHLOVE,” Justin tweeted after the show.

The day before, Justin performed at Hot 99.5′s Jingle Ball at The Patriot Center in Washington, D.C.

35+ pictures inside…