Alvin, Simon and Theodore come to believe Dave is going to propose to his new girlfriend in Miami and dump them. They've three days to stop the proposal, saving themselves not only from losing Dave but possibly from gaining a terrible stepbrother.
Animation • Kids
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Directors
Walt Becker
Cast
Jason Lee, Tony Hale, Kimberly Williams-Paisley, Josh Green, Justin Long, Matthew Gray Gubler, Jesse McCartney