Olivia Olson

Acting

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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.

Known for

Phineas and Ferb the Movie: Candace Against the Universe

The Laughter & Secrets of Love Actually: 20 Years Later – A Diane Sawyer Special

Credits

Love Actually (2003)
as Joanna Anderson
Phineas and Ferb the Movie: Candace Against the Universe (2020)
as Vanessa Doofenshmirtz (voice)
Phineas and Ferb: Star Wars (2014)
as Vanessa the Twi'Lek (voice)
Red Nose Day Actually (2017)
as Joanna
The Glorias (2020)
as Susanne Steinem (uncredited)
The Laughter & Secrets of Love Actually: 20 Years Later – A Diane Sawyer Special (2022)
as Self
Adventure Time: Fun with Finn and Jake (2012)
as Marceline the Vampire Queen (voice)
Voice Over (2012)
as Little Girl
Teller's Camp (2025)
as Sadie O'Leary
Grapefruit (2020)
as Grapefruit