Audio problem: Terri takes her friends out to a restaurant, and she starts singing a song, and where she says, "The way you swept me off my feet," her mouth doesn't move at all.
Audio problem: When they go to see the girl who wins the scholarship, as she is playing in the park, when Terri puts different music on the stand her bow continues to move, yet there is no sound.
Answer: All of the singing that Hilary Duff did in the film is her own. This is stated in the credits of the songs she did.
moviemogul