Justin Bieber 'CSI'CBS announced last Thursday that pop star Justin Bieber had signed on to play a troubled kid in an upcoming episode of its hugely popular crime drama 'CSI.' Producers were so excited about his appearance, they've decided to give him a multi-episode storyline. He will guest star on the show's Sept. 23 season premiere and return for the fifteenth episode of the season, which will air in Feb. 2011, Hollywood Life reports.