After getting into a car accident while drunk on the day of her sister’s wedding, Gwen Cummings is given a choice between prison or a rehab center. She chooses rehab, but is extremely resistant to taking part in any of the treatment programs they have to offer, refusing to admit that she has an alcohol addiction.
After discovering they are all dating the same same guy, three popular students from different cliques band together for revenge, so they enlist the help of a new gal in town and conspire to break the jerk’s heart, while destroying his reputation.
Pop sensations Alvin, Simon and Theodore end up in the care of Dave Seville’s twenty-something nephew Toby. The boys must put aside music super stardom 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.