Ben Affleck celebrated his brother Casey's best-actor Globes win for Manchester by the Sea (which Amazon bought at the Sundance Film Festival early last year) at this bash. The elder Affleck hung out in a back room for bit, then made his way to the front of the party. "Where's Matt?" he asked, walking by a crowded dance floor in search of Matt Damon. Found him! His longtime pal was tucked in a corner with his wife, Luciana, who was dancing with Pataky.