Known for her beautiful voice, it only seems fitting that Olson took on voice acting after her role in Love Actually.
Olson is best known as the voice of Marceline the Vampire Queen on the popular show Adventure Time, which aired from 2010 to 2018, and the voice of Vanessa Doofenshmirtz on Disney Channel's Phineas & Ferb, which aired from 2008 to 2015 (via Refinery 29).
The young actor's voice can also be heard in the hit show The Powerpuff Girls, which aired from 2017 to 2019, and in the Lego Dimensions video game. Olson is also expected to be featured in more animated TV series in 2020, according to IMDb.
Alongside voice acting, Olson contributed to the Adventure Time Encyclopedia, and picked her singing career back up in 2013 with the release of her debut EP Beauty is Chaos. She released another album, Nowhere Land, in 2018. Olson also frequently posts music on her YouTube channel, which currently has over 61,000 subscribers (via The Sun).
