The Big Wedding (2013) - Robert De Niro, Diane Keaton, Katherine Heigl

A long-divorced couple fakes being married as their family unites for a wedding.

Director: Justin Zackham
Writers: Justin Zackham (screenplay), Jean-Stéphane Bron (motion picture "Mon frère se marie")
Stars: Robert De Niro, Diane Keaton, Katherine Heigl