EXCLUSIVE: ABC Family has firmed up casting on its new untitled drama pilot from The Secret Life of the American Teenager creator Brenda Hampton. Katelyn Tarver (Nick’s Big Time Rush), Valerie Tian (Juno), Ana Lucasey (Lie to Me), and Christian Serratos (the Twilight saga) will headline the hour-long project, which revolves around four ethnically diverse teenage girls who attend private school in California. Rounding out the cast are Domain-repped Brad Rowe (Tell Me You Love Me) and Larry Clarke. Michael Ausiello will be contributing to Deadline.com and Movieline.com as he preps for the January launch of a new TV-centric website.