Sequel to the live-action/CGI-animated story of the world-famous, singing, pre-teen, chipmunk trio. When Alvin (voice of Justin Long), Simon (Matthew Gray Gubler) & Theodore (Jesse Mc Cartney) are forced to put aside their music superstardom & go back to school, they are given the challenge of saving the school's music department by winning the $25, 000 prize in a battle of the bands. But the Chipmunks unexpectedly meet their match in three singing female chipmunks known as The Chipettes: Brittany (Anna Faris), Eleanor (Amy Poehler) & Jeanette (Christina Applegate). Romantic & musical sparks fly in the face off that ensues between The Chipmunks & The Chipettes.