Alanna Noel Ubach (born October 3, 1975) is an American actress and singer of and descent. She is known for her roles in as Serena McGuire, and as Isabel Villalobos. She has provided voices for several characters in a number of animated television shows and movies, such as on , the title character on , on , Strudel on (2010), and four characters in the -winning animated film . She played the first female assistant, Josie, on . She also wrote and performed a one-woman show.