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When long divorced couple Don (Robert De Niro) and Ellie (Diane Keaton) get together for their adopted son Alejandro's (Ben Barnes) wedding to Missy (Amanda Seyfried), they think it will be a piece of cake. Even Don's current girlfriend Bebe (Susan Sarandon), and Don and Ellie's birth children Lyla (Katherine Heigl) and Jared (Topher Grace) think nothing of it. But when news comes about that Alejandro's incredibly Catholic birth mother is coming to the wedding arises, Alejandro has just one request of his parents...pretend to be married.