Olivia Olson
With a name like this, you might think she’s related to the Olsen twins, Mary-Kate and Ashley. But no – that’s Olivia Olson with an “e,” not an “o.” You might remember Olson from her singing role in Love Actually, where she performed a cover of Mariah Carey’s staple hit, All I Want for Christmas is You.
Following this film, she hasn’t appeared in a huge number of shows and films, but the roles that she had were pretty significant. For example, she voiced Vanessa in Phineas & Ferb, Marceline in Adventure Time, and Blisstina in The Powerpuff Girls. It takes some serious acting ability to become a voice actor like this!