Justin Bieber to guest star on ‘CSI’ — and the evidence points to typecasting. Is it not enough that Justin Bieber got behind the wheel of a Lamborghini, courtesy of P. Diddy? The 16-year-old singing sensation is also getting behind a guest-starring role on the season premiere of “CSI,” courtesy of CBS, Show Tracker reports. In the Sept. 23 season premiere, Bieber will play — shock — a 16-year-old singing sensation who’s “faced with a terrible decision regarding his only brother.” As opposed to a 16-year-old singing sensation faced with a terrible decision about which drive-thru to cruise to in the Lambo? Past stunt casting on “CSI” has included turns by John Mayer, Taylor Swift, Kevin Federline, Tony Curtis, Travis Barker and Danny Bonaduce.