6. Mistresses: Season 3
Absolutely Fabulous star Joanna Lumley adds a distinctly vinegary note to the third season of this sexy series, which is centered around four friends whose lives have been touched by infidelity. Mistresses has become a reliable incubator for U.S. TV stars, sending Anna Torv and Orla Brady off to Fringe and graduating Raza Jaffrey to NBC’s new musical series Smash. For more of the show’s famous alums, click here. Mistresses airs Wednesdays at 10/9c on BBC America.