【How-to】Who voices princess bubblegum - Howto.org

Isabella Acres is the voice actress for 13-year-old Princess Bubblegum, who first appears at the very end of “Mortal Recoil,” and in “Too Young” until the end of that episode, when Princess Bubblegum is restored to her 18-year-old form, at which point Hynden Walch returns as her voice actress.