Olivia Olson

Olivia Rose Olson (born May 21, 1992) is an American actress and singer-songwriter, known for her role as Joanna singing „All I Want for Christmas Is You” in Love Actually, 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 Encyclopaedia and an upcoming book for Cartoon Network.

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