Alvin and The Chipmunks 2

During the Chipmunks' benefit concert in Paris, France, Dave Seville (Jason Lee) suffers a severe injury, when Alvin (Justin Long) jumps on top of a scaffolding and a falling billboard sends Dave flying across the stage into some electric devices. After the accident, he is rushed to the hospital. Although he survives, he must stay for a few days to recover, so he leaves his lazy 21-year-old cousin Toby (Zachary Levi) and kind Aunt Jackie (Kathryn Joosten) in charge of the Chipmunks until he returns. Prior to the event, Dave had made arrangements for Alvin, Simon (Matthew Gray Gubler), and Theodore (Jesse McCartney) to go to school. But, at the airport, Aunt Jackie falls down some stairs and has to go to the hospital too, so Toby is left in charge. Little do Dave and Toby know, on their very first day at school, the Chipmunks feel like "Chipmunks Out of Water" with all the human students and bullies around. The boys have fun being babysat by Toby, mainly because he is basically a big kid himself. Theodore tries his best to bond with Toby but Toby is always either ignoring him or being short towards him.

Meanwhile, Ian Hawke (David Cross) now lives in the basement of Jett Records. But, a FedEx mail comes to the building and happens to be three singing female chipmunks, The Chipettes, Brittany (Christina Applegate), Jeanette (Anna Faris), and Eleanor (Amy Poehler). He adopts them, and cannot wait to be famous, and get his sworn revenge on the Chipmunks. Although the Chipettes accept, they do not know that Ian lost his job. The Chipmunks meet the Chipettes and fall in love with them, until they discover they're on Ian's side. The Chipmunks and the Chipettes end up competing against each other for a chance to enter the Battle of the Bands to win $25,000 and save the school's music program. The Chipettes win after Simon and Theodore forfeit because Alvin failed to show up (at the time he instead hung out with the football team). Eager to get rich quick, Ian videotapes the Chipettes performance and posts it on the internet, along with his phone number.

Soon, the Chipettes are hired as the opening act at a Britney Spears concert at the Staples Center. Since the concert is on the same night as the Battle of the Bands, Ian decides to blow off the battle and force the Chipettes to perform at the concert, threatening to barbeque them if they don't. When the Chipettes realize they've been tricked, Ian kidnaps them but Alvin saves them on his motorcycle, and Ian fails again. Then, Dave comes home and sees the Chipmunks school concert. All the chipmunks join to sing We Are Family. Meanwhile, Ian dresses up as a Chipette performing in the center alone while people boo him. Finally, the Chipettes are re-adopted at the boy's request and sleep over at the Chipmunks' house where Dave has another injury, tripping over Alvin's skateboard and ending the movie with the famous line "ALVINNNNNNNNNNNNN!"

for the trailer, click this link :
http://www.youtube.com/watch?v=tmiSj1azApY