Quaint and crass get together — or would that be “bump uglies”? — with awkward, thoroughly flat results in “The Big Wedding,” an ensemble comedy with a tonal cluelessness as surprising as the name cast that signed on for it anyway.
Adapted by writer-director Justin Zackham from the French import “Mon frère se marie,” the film stars Robert De Niro and Diane Keaton as Don and Ellie, a long-divorced couple whose reunion is, well, a farce. As everyone gathers for the marriage of the couple’s adopted son, Alejandro (Ben Barnes, “The Chronicles of Narnia”), they encounter a snag. Alejandro’s biological mom (Patricia Rae) is on the way from Colombia, and it turns out that she has a contrived, pathologically traditional objection to divorce. What to do, what to do? Don and Ellie reluctantly decide to pretend they’re still married — an idea that, go figure, doesn’t sit well with Bebe (Susan Sarandon), the free spirit whom lusty Don left Ellie for years ago.