Alvin and the Chipmunks (movie series)
Through a series of misunderstandings, Alvin (Justin Long), Simon (Matthew Gray Gubler) and Theodore (Jesse McCartney) come to believe that Dave (Jason Lee) 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.