The first trailer and poster for the ensemble romantic comedy The Big Wedding have been released.  The film centers on a divorced couple (Robert De Niro and Diane Keaton) who are forced to pretend like they’re still married when their adopted son’s (Ben Barnes) deeply religious biological mother comes to town for his wedding.  Zaniness ensues.  Though the involvement of Katherine Heigl puts this one immediately on iffy ground, the highlight of the trailer is the chemistry between De Niro and Keaton. If the film focuses mainly on their relationship, we might be in for a fairly amusing rom-com.  That said, the clip definitely plays up the farcical tone and “wacky antics” that occur when everything goes awry, so I’m not exactly holding my breath.

Hit the jump to watch the trailer.  Directed by Justin Zackham, the film also stars Amanda Seyfried, Susan Sarandon, Topher Grace, and Robin Williams.  The Big Wedding opens on October 26th.

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Here’s the synopsis for The Big Wedding:

With an all-star cast lead by Diane Keaton, Robert De Niro, Susan Sarandon, Robin Williams, Katherine Heigl, Amanda Seyfried and Topher Grace, THE BIG WEDDING is an uproarious romantic comedy about 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 (De Niro and 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.