Just one day after it was announced that 16-year-old teen idol Justin Bieber had been cast in the season-premiere episode of CBS's Csi Crime Scene Investigation , Bieber posted a photo of himself taken on the set of the series, along with remarks on Twitter, in which he commented, "BIG DAY today...excited. doing something new." The photo on the site, which was quickly picked up by numerous entertainment sites, shows Bieber in what appears to be a red jumpsuit (prison fatigues?) with his arms behind his back as if he's about to be handcuffed by the man standing behind him, who could be a plain-clothes police officer. "I told you I was a BAD MAN!!" he tweeted. The episode is scheduled to air on September 23, and, if Bieber's fans tune in in force, it could kick off CBS's season with sky-high ratings.