Voice actress and singer who appeared as a child in the romantic comedy film Love Actually and who released the EP Beauty is Chaos in 2013.
She voiced the role of Marceline the Vampire Queen on the animated series Adventure Time.
She sang a duet with Ashley Tisdale for the Disney Channel animated musical series Phineas and Ferb.
Her role as Joanna Anderson in Love Actually led her to make further appearances on The Tracy Morgan Show and The Ellen DeGeneres Show.
She was adopted by writer Martin Olson and grew up in Los Angeles with one brother.
- The meaning of the name Olson: Son Of Olaf