Celebrity foster parent Rosie O'Donnell has been cast in Jennifer Lopez's hit new TV drama about the care system. The comedian-actress will play a mentor to the family in The Fosters and appear in three episodes to air next year (14). O'Donnell landed the role after tweeting about her love for the show, which stars Teri Polo and Sherri Saum as a lesbian couple raising a family of foster and biological kids. She says, "I am thrilled to be a part of this wonderful, heartwarming show. My kids and I never miss it."