Olivia Olson (born Olivia Rose Olson; May 21 1992) is an American actress and singer-songwriter known for her role as Joanna singing All I Want For Christmas Is You in Love Actually (2003) and for her voice roles as Vanessa Doofenshmirtz in Phineas and Ferb and Marceline the Vampire Queen in Adventure Time. Given a list of categories: company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, what category does the paragraph belong to?
A:
Artist