Cast member Diane Keaton arrives to attends the premiere of the film "Mad Money" in Los AngelesLOS ANGELES (TheWrap.com) - Robert De Niro and Diane Keaton are sharing the big screen together as a divorced couple forced to pretend they're still married in "The Big Wedding." The romantic comedy is jammed with talent, boasting a cast that includes Susan Sarandon, Robin Williams, Topher Grace, Amanda Seyfried and Katherine Heigl. But based on a new trailer that hit the web Tuesday, De Niro and Keaton are a long way from "Raging Bull" and "Reds." Based on the breezy sneak peak, the two screen legends are enjoying themselves, but the film itself seems to be a big bouquet of comedy cliches. ...