Alvin and the Chipmunks: The Squeakquel (2009)

Alvin, Simon and Theodore must put aside music superstardom and return to school, where they look to win a $25,000 prize in a battle of the bands contest in order to save their school's music program. But the Chipmunks unexpectedly meet their match in three singing chipmunks known as The Chipettes -- Brittany, Eleanor and Jeanette.