The Big Wedding 

In Movie Theaters: Friday, April 26, 2013

Director: Justin Zackham

Cast: Robert De Niro . . . Don 

         Diane Keaton . . . Ellie Griffin
         Katherine Heigl . . . Lyla Griffin 
        Amanda Seyfried . . . Missy O'Connor 
        Topher Grace . . . Jared Griffin 
        Robin Williams . . . Father Moinighan 

Companies: Lionsgate Films

Plots:

To the amusement of their adult children and friends, long divorced couple Don and Ellie Griffin (Robert De Niro and Diane Keaton) are once again forced to play the happy couple for the sake of their adopted son's wedding after his ultra conservative biological mother unexpectedly decides to fly halfway across the world to attend. With all of the wedding guests looking on, the Griffins are hilariously forced to confront their past, present and future - and hopefully avoid killing each other in the process.

the official version from lionsgate.com on August 3, 2012

A long-divorced couple who, for the sake of their adopted son's wedding and his biological mother, pretend they are still married.

verbatim from variety.com on May 14, 2011

Story Line: 

Storyline

Follows a charmingly modern family trying to survive a weekend wedding celebration that has the potential to become a full blown family fiasco.

To the amusement of their adult children and friends, long divorced couple Don and Ellie Griffin (Robert De Niro and Diane Keaton) are once again forced to play the happy couple for the sake of their adopted son's wedding after his ultra conservative biological mother unexpectedly decides to fly halfway across the world to attend. With all of the wedding guests looking on, the Griffins are hilariously forced to confront their past, present and future - and hopefully avoid killing each other in the process.