Olivia Olson

Olivia Olson (born Olivia Rose Olson; May 21,992 1 in Los Angeles, California) is an American actress, voice actress as 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 Milo Murphy's Law in addition to her as Marceline the Vampire Queen in Adventure Time. Olivia is also a writer for a variety of books.

Voice roles in Idea Wiki

 * Crystal Universe 8 - Kimberly Price
 * Livin' the Life with the Stereotypes - Mayor Faith Hughes
 * Kingdom Hearts series, untitled PnF/RC9GN/SVTFOE Crossover Beat-'em-up ARPG Video Game that has Randy, Marco and Vanessa, altogether as the Main Protagonist Trio for the Game's Main Story, Disney vs. Capcom: Warriors of Weirdmageddon - Vanessa Doofenshmirtz, additional voices
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 * Ryan & Beth - Eve
 * The Dynamic Girls - Diva Psych
 * The Good Guys - Alien Gal
 * Best Beasties - Jennifer Raven (season 1 only)
 * DC vs. Sega - Wonder Woman
 * Gumbarriors! Defenders of Elmore - Ashley Watterson
 * Super Robot Monkey Team Hyperforce Go! (Reboot) - Gemini