Olivia Olson
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Olivia Rose Olson (born May 21, 1992) is an American actress and singer-songwriter, mostly known for her voice roles as Vanessa Doofenshmirtz in Phineas and Ferb and Marceline the Vampire Queen in Adventure Time. She also played the character of Joanna in the 2003 film Love Actually and its 2017 short sequel Red Nose Day Actually.

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 series Phineas and Ferb. Olson has also appeared on The Tracy Morgan Show and guest starred on The Ellen DeGeneres Show singing with DeGeneres, actor Jack Black and Broadway star Kristin Chenoweth. She is currently a cast member and singer on two animated series: Cartoon Network's series Adventure Time, playing Marceline the Vampire Queen and on Disney's animated series Phineas and Ferb playing Vanessa Doofenshmirtz, the sarcastic daughter of the evil Dr. Doofenshmirtz. In Adventure Time, her father, Martin Olson, plays Marceline's dad Hunson Abadeer and Marceline sang a short song about him eating her French fries. She also sings a number of songs in Phineas and Ferb, including the duet "Busted!" with Ashley Tisdale as well as popular solo songs, including "I'm Me," "Not So Bad a Dad After All," "I'm Lindana and I Wanna Have Fun," "Happy New Year" and many others, including her song in the Phineas and Ferb Christmas Vacation special "Got That Christmas Feeling." She has written songs for Phineas and Ferb and has written and recorded her own songs with renowned music producers Rick Nowels, Camara Kambon and Hollywood jazz great Rob Mullins.