Olivia Olson

Olivia Olson
Gender:	Female
Date of birth:	(1992-05-21) May 21, 1992
Place of birth:	Los Angeles, CA
Role(s):	Actress, singer, songwriter
Character(s) played:	Vanessa Doofenshmirtz Shelley
Other projects:	Phineas and Ferb Love Actually Adventure Time

Olivia Rose Olson (born May 21, 1992) is an American actress and singer-songwriter, most notable for her roles as Vanessa Doofenshmirtz on Phineas and Ferb and Marceline in Adventure Time.

She is the adoptive daughter of Martin Olson.

She provides the voice of Shelley, who hosted the Battle of the Bands event, and later reprises her role as Vanessa.