Through a series of misunderstandings, Alvin, Simon and Theodore come to believe that Dave is going to propose to his new girlfriend in New York City - and dump them. They have three days to get to him and stop the proposal.
- Genre: Adventure, Animation, Comedy, Family
- Studio: Regency Enterprises, Fox 2000 Pictures, Sunswept Entertainment, Bagdasarian Productions, TSG Entertainment
- Keyword: chipmunk, anthropomorphism, hitchhiker, aftercreditsstinger, duringcreditsstinger, live action and animation
- Cast: Jason Lee, Justin Long, Bella Thorne, Matthew Gray Gubler, Jesse McCartney, Kaley Cuoco