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 (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 Encyclopaedia and an upcoming book for Cartoon Network.
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U love how you sing your awesime 11 =-D
Aw, she`s so talented and seems so sweet. I wish only the best for her.
she is a wonderful girl.
I loved her in Love Actully think she is an aamazing singer!!!