Like Mary Kate Olsen before her, Trachtenberg will play a pot dealer on the Showtime series -- but her character will be one of Nancy's rivals, not one of her coworkers. Look for the actress also known as Georgina Sparks to pop up in two episodes this season.
In other TV news ...
• Sarah Michelle Gellar may be a geek icon, but the actress has only been to Comic Con once before.That is, until this year's 'Ringer' panel. [EW]
• G4 has scheduled the remaining episodes of Ryan Dunn's 'Proving Ground.'The network will air a special dedicated to the late daredevil on July 19. [THR]
• 'The Voice' judges are going classic rock again for this week's number. Cee Lo Green, Christina Aguilera, Adam Levine and Blake Shelton will perform 'You Can't Always Get What You Want' during tomorrow night's final performance show. [NBC]
• ABC Family is keeping it in the, uh, family (sorry) for its latest original movie. 'Teen Spirit' will star 'Make It or Break It''s Cassie Scerbo, '10 Things I Hate About You''s Lindsey Shaw and ... Tim Gunn. It debuts Aug. 7. [ABC Family]