Like Brian Griffin said, this is his twin sister, Brianna. Currently, Brianna is living with a family in Hollywood, California. She just happened to be passing through Quohog, on her way to Boston to preform on stage. Brianna is a famous singer, with a voice like Celine Dion. In fact, that's who she sounds like. She was walking through the MegaMall in Quohog when she ran into Brian.