Through a series of misunderstandings, Alvin, Simon and Theodore come to believe that Dave 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.
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- Director : Walt Becker
- Writers : Randi Mayem, Adam Sztykiel
- Actors : Jason Lee, Tony Hale, Kimberly Williamss-Paisley, Josh Green, Justin Long, Matthew Gray Gubler, Jesse McCartney, Kaley Cuoco-Sweeting, Anna Faris, Christina Applegate
- Genre : Comedy
- Run Time : 1 hour 28 minutes
- Release Date : December 23rd, 2015