ZiCon welcomes Olivia Olson

An American actress and singer-songwriter, known for her role as Joanna singing "All I Want for Christmas Is You" in Love Actually (2003) and for her voice roles as Vanessa Doofenshmirtz in Phineas and Ferb and Marceline the Vampire Queen in Adventure Time. Olson is also a writer, contributing a section to the best-seller Adventure Time Encyclopedia and an upcoming book for Cartoon Network. Olson has appeared as a singer and actress on television shows and in live theatre, including Comedy Central Stage, the HBO Theater, The Fake Gallery, and the Disney Channel.