Alvin and the Chipmu
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.
E.B., the Easter Bunny's teenage son, heads to Hollywood, determined to become a drummer in a rock 'n' roll band. In LA, he's taken in by Fred after the out-of-work slacker hits E.B. with his car.
The Wedding Ringer
Two weeks shy of his wedding, a socially awkward guy enters into a charade by hiring the owner of a company that provides best men for grooms in need.