Charlize Theron
The 18-year-old award winning Swift filmed her role a week ago, playing herself and singing one of her own songs in the background of a scene.
American Idol contestant Bucky Covington and fellow country singers Rascal Flatts also appear in the movie. All three acts are also signed to Disney's Lyric Street Records.
Miley Cyrus and her dad Billy Ray Cyrus both star in the Hannah Montana movie, due out in theaters next year (2009).