While lots of people watch 'CSI,' its core audience isn't exactly teen (and tween) girls. But that's about to change, with CBS announcing Thursday that heart-melter Justin Bieber has signed on to play a troubled kid in an upcoming episode of the hugely popular crime drama.

The network said in a statement that The Biebs will make his primetime acting debut as Jason McCann, a "troubled teen who is faced with a terrible decision regarding his only brother."

This decision will lead the 'Baby' boy "into an explosive confrontation with the CSIs" that the network says won't be resolved until later in the season.

Turning saccharine Bieber into a bad kid will be a feat of TV magic, and the singer is already hard at work, telling his Twitter followers that he's working with an acting coach and "learning a new craft."