Plot: The world famous singing pre-teen chipmunk trio return to contend with the pressures of school, celebrity, and a rival female music group known as The Chipettes.Pop sensations Alvin, Simon and Theodore end up in the care of Dave Seville's twenty-something nephew Toby (Levi). The boys must put aside music superstardom to return to school, and are tasked with saving the school's music program by winning the $25,000 prize in a battle of the bands. But the Chipmunks unexpectedly meet their match in three singing chipmunks known as The Chipettes -– Brittany, Eleanor and Jeanette. Romantic and musical sparks are ignited when the Chipmunks and Chipettes square off.

Source#1:Watch "Alvin and the Chipmunks: The Squeakquel" (2009)Online-full