To the amusement of their adult children and friends, long divorced couple Don and Ellie Griffin (Robert De Niro & 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. Also starring as part of the ensemble cast are Katherine Heigl, Amanda Seyfried, Topher Grace, Ben Barnes, Susan Sarandon & Robin Williams.