Justin Bieber has been busy flaunting his gym body on Instagram.

The Confident singer took to the image-sharing website to show off snaps of himself working up a sweat, with of course, his top off.

[related]In the pics, JB can be seen flexing his muscles, displaying his toned torso and his extensive collection of tattoos, which includes two full arm sleeves, as well as some designs on his chest and stomach.

He accompanied the collage of photos with the caption: "Back in the gym #dontbescared #orangegymrats."

The Biebs also hit the headlines this week after he was involved in a car crash in Los Angeles - with the star escaping unscathed from the accident.