Director: Justin Zackman Starring: Robert De Niro, Katherine Heigl, Diane Keaton, Susan Sarandon, Robin Williams, Amanda Seyfried, Topher Grace, Ben Barnes Written by: Justin Zackman, (based on the motion picture Mon frère se marie) Jean-Stephane Bron and Karine Sudan Running Time: 89 mins Cert: 15 Release date: 29th May 2013 Sitting watching this painful romantic comedy,…