Madison Michelle Pettis (born July 22, 1998) is an American actress. In Phineas and Ferb, she voices Adyson Sweetwater, one of the Fireside Girls. She is known for playing the role of Sophie in Cory in the House. She has also starred in Mostly Ghostly: Who Let the Ghosts Out? as a ghost. She appeared as one of the 5th graders on Are You Smarter Than a Fifth Grader? for the 2008 series. She currently voices Izzy in Jake and the Never Land Pirates, a Disney Junior series, and appears in the sitcom Life With Boys.