Justin Bieber rocks out at Hot 99.5′s Jingle Ball 2012 held at The Patriot Center on Tuesday night (December 11) in Washington, D.C. The 18-year-old musician flashed his abs for the cameras and crowd while performing during the holiday event.

“Always a good day when i find out two 90,000 big stadiums in S Africa got SOLD OUT for the #BELIEVEtour in 1 DAY 5 months b4 the show!” Justin happily tweeted.

Justin Bieber singing Beauty And A Beat at the Hot 99.5 Jingle Ball at the Patriot Center in Fairfax, VA on 12/11/12

Justin Bieber singing Be Alright at the Hot 99.5 Jingle Ball at the Patriot Center in Fairfax, VA on 12/11/12

Justin Bieber singing Fall at the Hot 99.5 Jingle Ball at the Patriot Center in Fairfax, VA on 12/11/12.