Canadian teen idol --- JUSTIN BIEBER now turns his sight on acting! By winning the guest role in the hit TV series "CSI", the CBS television said on thursday.

"CSI" is one one of the most-watched drama series on U.S. television and widely syndicated around the globe.

The "CSI" producer called Bieber (whose his music video for BABY sold 250 million view on video -- a world phenomenon).

Bieber, 16, will play a role of a troubled teen who is faced with difficult decision regarding his only brother. The pop singer will appear in the season premiere  of CSI this September, and then makes other appearances later in the year as his storyline concludes.

Bieber signed a record deal at age 14 after posting some home videos on YouTube. And he is now currently promoting his No.1 album "MY WORLD 2.0"