Matt Damon, 50, was all smiles while third-wheeling with Jennifer Lopez, 52, and Ben Affleck, 48, on the beach in Los Angeles on Sunday (Aug. 8). The Good Will Hunting actor was pictured walking beside Bennifer, who held hands, of course, on a private beach in Malibu near Paradise Cove. All three A-list stars looked to be having an absolute blast together, as indicative by their big smiles in the snapshots, which were obtained by TMZ.