Madeleine Martin (born April 15, 1993[1]) is an American actress, known for voicing JoJo Tickle, the title character on the Playhouse Disney children's animated TV series JoJo's Circus and Fionna Campbell in the Cartoon Network series Adventure Time and its Max spin-off Adventure Time: Fionna and Cake, and for playing the character Rebecca "Becca" Moody on the Showtime comedy-drama Californication and Shelley Godfrey from the second and third seasons of the Netflix horror series Hemlock Grove.

She appeared on Broadway in the title role in A Day in the Death of Joe Egg at the age of 10; her acclaimed performance gave her the opportunity to be the youngest presenter in history at the 2003 Tony Awards.

Martin originated the role of "Jean Fordham" on Broadway in the hit play August: Osage County.

[citation needed] In 2010, she was a co-star alongside John Cena in the WWE Studios film, Legendary.

[8] Martin performed in the Atlantic Theater Company's production of Harper Regan in 2012 and on Broadway in Picnic in 2013.

[9] From 2014 to 2016, she played Shelley Godfrey in the second and third seasons of Hemlock Grove and had a guest role on The Good Wife.