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Biography
Olivia Olson is an American actress, singer-songwriter, and screenwriter, largely 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.
Source: Wikipedia · CC BY-SA
Filmography15 titles

Adventure Time: Side Quests
2026as Marceline (voice)
2026as Marceline (voice)

Adventure Time: Fionna and Cake
2023as Marceline / Celine (voice)
2023as Marceline / Celine (voice)

Adventure Time
2010as Marceline the Vampire Queen (voice)
2010as Marceline the Vampire Queen (voice)

Steven Universe
2013as Pop Singer (voice)
2013as Pop Singer (voice)

Adventure Time: Distant Lands
2020as Marceline the Vampire Queen / Additional Voices (voice)
2020as Marceline the Vampire Queen / Additional Voices (voice)

Zoey 101
2005as Girl #1
2005as Girl #1

Phineas and Ferb
2007as Vanessa Doofenshmirtz (voice)
2007as Vanessa Doofenshmirtz (voice)

We Baby Bears
2022as Ursa (voice)
2022as Ursa (voice)

Phineas and Ferb the Movie: Candace Against the Universe
2020as Vanessa Doofenshmirtz (voice)
2020as Vanessa Doofenshmirtz (voice)

Phineas and Ferb: Star Wars
2014as Vanessa the Twi'Lek (voice)
2014as Vanessa the Twi'Lek (voice)

Love Actually
2003as Joanna Anderson
2003as Joanna Anderson

Fast & Furious Spy Racers
2019as PizzaRave / Jun (voice)
2019as PizzaRave / Jun (voice)

The Glorias
2020as Susanne Steinem (uncredited)
2020as Susanne Steinem (uncredited)

Teller's Camp
2025as Sadie O'Leary
2025as Sadie O'Leary

The Powerpuff Girls
2016as Bliss (voice)
2016as Bliss (voice)