Before we figured out who the Unicorn really was, we were given a few clues: she's crafty, five-foot-six, from Beverly Hills, and apparently always wanted to sing. (When she sings on the show, though, Robin Thicke quips, "She doesn't sound like a trained singer.") Also, her nickname is "Bird," and discusses quite a bit how she has low self-esteem. So, who is she?