Bob, Al, Robert Duvall, James Caan, Diane Keaton, Talia Shire and even Francis Ford Coppola himself reunited Saturday for the closing night of the Tribeca Film Festival in NYC.

De Niro, who runs the festival, got the panel together after a back-to-back screening of Part 1 & 2 of the classic mobster movies. Noone of the actors could resist. It's also the 45th anniversary of Part 1.

The old cast remembered what went down behind the scenes of the movies. The cat wandered onto Marlon Brando's lap and Al and Diane got loaded after the wedding scene and everyone was mooning each other at one point on set.

The whole event lasted nine hours, but it was lovely to see stars come together once again.