Olivia Olson

Olivia Rose Olson (born May 21st, 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 the host of Battle of the Bands in Battle of the Bands.

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