Justin Bieber Goes Topless

Justin Bieber shows off his muscles!

The 18 year old pop star recently took off his shirt and flexed his muscles while filming a new NBC documentary called All Around the World. He bared his chest right in front of his female assistant and the camera while changing outfits during his Believe tour and gave the camera a little flex.

Check out Justin Bieber going topless and sound off in the comments!