Justin Bieber shows off hot abs and black leather in concert • 12/12/2012, 10:48 AM

Justin Bieber has been working out and he's super proud to show his screaming fans his progress. Take a look at Bieber performing at Hot 99.5's Jingle Ball 2012 in Washington, D.C. last night (December 11).

Justin Bieber has been working out and he's super proud to show his screaming fans his progress. Take a look at Bieber performing at Hot 99.5's Jingle Ball 2012 in Washington, D.C. last night (December 11).

Justin Bieber has been working out and he's super proud to show his screaming fans his progress. Take a look at Bieber performing at Hot 99.5's Jingle Ball 2012 in Washington, D.C. last night (December 11).

Justin Bieber has been working out and he's super proud to show his screaming fans his progress. Take a look at Bieber performing at Hot 99.5's Jingle Ball 2012 in Washington, D.C. last night (December 11).

Justin Bieber has been working out and he's super proud to show his screaming fans his progress. Take a look at Bieber performing at Hot 99.5's Jingle Ball 2012 in Washington, D.C. last night (December 11).

Justin Bieber has been working out and he's super proud to show his screaming fans his progress. Take a look at Bieber performing at Hot 99.5's Jingle Ball 2012 in Washington, D.C. last night (December 11).

Justin Bieber has been working out and he's super proud to show his screaming fans his progress. Take a look at Bieber performing at Hot 99.5's Jingle Ball 2012 in Washington, D.C. last night (December 11).

Justin Bieber has been working out and he's super proud to show his screaming fans his progress. Take a look at Bieber performing at Hot 99.5's Jingle Ball 2012 in Washington, D.C. last night (December 11).

Justin Bieber has been working out and he's super proud to show his screaming fans his progress. Take a look at Bieber performing at Hot 99.5's Jingle Ball 2012 in Washington, D.C. last night (December 11).

Justin Bieber has been working out and he's super proud to show his screaming fans his progress. Take a look at Bieber performing at Hot 99.5's Jingle Ball 2012 in Washington, D.C. last night (December 11).

Justin Bieber has been working out and he's super proud to show his screaming fans his progress. Take a look at Bieber performing at Hot 99.5's Jingle Ball 2012 in Washington, D.C. last night (December 11).

Justin Bieber has been working out and he's super proud to show his screaming fans his progress. Take a look at Bieber performing at Hot 99.5's Jingle Ball 2012 in Washington, D.C. last night (December 11).

Justin Bieber has been working out and he's super proud to show his screaming fans his progress. Take a look at Bieber performing at Hot 99.5's Jingle Ball 2012 in Washington, D.C. last night (December 11).

Justin Bieber has been working out and he's super proud to show his screaming fans his progress. Take a look at Bieber performing at Hot 99.5's Jingle Ball 2012 in Washington, D.C. last night (December 11).

Justin Bieber has been working out and he's super proud to show his screaming fans his progress. Take a look at Bieber performing at Hot 99.5's Jingle Ball 2012 in Washington, D.C. last night (December 11).

Justin Bieber has been working out and he's super proud to show his screaming fans his progress. Take a look at Bieber performing at Hot 99.5's Jingle Ball 2012 in Washington, D.C. last night (December 11).

Justin Bieber has been working out and he's super proud to show his screaming fans his progress. Take a look at Bieber performing at Hot 99.5's Jingle Ball 2012 in Washington, D.C. last night (December 11).

Justin Bieber has been working out and he's super proud to show his screaming fans his progress. Take a look at Bieber performing at Hot 99.5's Jingle Ball 2012 in Washington, D.C. last night (December 11).

Justin Bieber has been working out and he's super proud to show his screaming fans his progress. Take a look at Bieber performing at Hot 99.5's Jingle Ball 2012 in Washington, D.C. last night (December 11).

Justin Bieber has been working out and he's super proud to show his screaming fans his progress. Take a look at Bieber performing at Hot 99.5's Jingle Ball 2012 in Washington, D.C. last night (December 11).

Justin Bieber has been working out and he's super proud to show his screaming fans his progress. Take a look at Bieber performing at Hot 99.5's Jingle Ball 2012 in Washington, D.C. last night (December 11).

Justin Bieber has been working out and he's super proud to show his screaming fans his progress. Take a look at Bieber performing at Hot 99.5's Jingle Ball 2012 in Washington, D.C. last night (December 11).

Justin Bieber has been working out and he's super proud to show his screaming fans his progress. Take a look at Bieber performing at Hot 99.5's Jingle Ball 2012 in Washington, D.C. last night (December 11).

Justin Bieber has been working out and he's super proud to show his screaming fans his progress. Take a look at Bieber performing at Hot 99.5's Jingle Ball 2012 in Washington, D.C. last night (December 11).

Justin Bieber has been working out and he's super proud to show his screaming fans his progress. Take a look at Bieber performing at Hot 99.5's Jingle Ball 2012 in Washington, D.C. last night (December 11).

Justin Bieber has been working out and he's super proud to show his screaming fans his progress. Take a look at Bieber performing at Hot 99.5's Jingle Ball 2012 in Washington, D.C. last night (December 11).

Justin Bieber has been working out and he's super proud to show his screaming fans his progress. Take a look at Bieber performing at Hot 99.5's Jingle Ball 2012 in Washington, D.C. last night (December 11).