Justin Bieber Bad Man On CSI Set

justin-bieber-bad-man-on-csi-setForget the clean cut tween image — Justin Bieber is a “bad man.”

The Biebs Tweeted about his previously announced cameo on “CSI” on Friday, and even posted a photo of himself in an orange jail jumpsuit.

“amazing day…excited for you guys to get to watch it,” Justin Tweeted, following his day on the “CSI” set.

“and I told you I was a BAD MAN!!” he wrote, including the photo from the set.

As previously reported on AccessHollywood.com, the “Baby” singer will play Jason McCann, a “troubled teen faced with a terrible decision regarding his only brother.”

Justin was apparently taking his acting gig seriously, as he even got some help before the cameras rolled.

“Morning world… we got the acting coach here… learning ‘a new craft,’” he Tweeted on Thursday.

However, it wasn’t all strictly business on the set, as the singer hinted on his Twitter page.

“and yes i did prank the EP of the show…somebody got locked in the closet,” he wrote.

– NBC News