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.
Songs: "Derby Racers" (My Little Pony: Friendship is Magic), "Summer All Over the World" (Phineas and Ferb), "If I Could Talk to Money" (SpongeBob SquarePants), and "Normal Little Girls" (PowerPuff Girls).
