Music manager Dave (Jason Lee) is not only enjoying a burgeoning career, but a blossoming romance with Samantha (Kimberly Williams-Paisley), a beautiful doctor who works in the emergency room. Through a series of misunderstandings, the chipmunks start to believe that a marriage proposal is on the horizon. Dreading the thought of an antagonistic stepbrother (Josh Green), Alvin (Justin Long), Theodore and Simon embark on a cross-country odyssey to prevent their best pal from ruining their lives.
Director: Walt Becker
Producer: Janice Karman, Ross Bagdasarian, Karen Rosenfelt, Arnon Milchan, John Starke and Steve Waterman
Cast: Jason Lee, Tony Hale, Kimberly Williams-Paisley, Josh Green, Bella Thorne, Justin Long, Matthew Gubler, Jesse McCartney, Kaley Cuoco, Anna Faris, Christina Applegate, John Waters, Redfoo, Jennifer Coolidge and Uzo Aduba