Through a series of misunderstandings, Alvin, Simon and Theodore come to believe that Dave is going to propose to his new girlfriend in Miami...and dump them. They have three days to get to him and stop the proposal, saving themselves not only from losing Dave but possibly from gaining a terrible stepbrother.
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
ALVIN AND THE CHIPMUNKS, a global phenomenon to generations of fans, becomes a live action/CGI motion picture event with a contemporary comic sensibility. Songwriter Dave Seville transforms singing chipmunks Alvin, Simon and Theodore into pop sensations -- while the out-of-control trio lays waste to Dave’s home, wreaks havoc on his career, and turns Dave’s once-orderly life upside-down.