NBC’s 30 Rock is continuing its grand tradition of stunt casting - in an upcoming episode, no less than Easy A and The Help star Emma Stone will appear. Stone, along with Andy Samberg and Nick Cannon, will play herself in a sequel parody of Garry Marshall’s New Year’s Eve and Valentine’s Day entitled Martin Luther King Day, in which Jane Krakowski’s Jenna Maroney somehow has become part of the starry cast. The episode will air January 26th.