Actress Greta Gerwig and “Greenberg” director Noah Baumbach’s reported romance is still going strong. The indie royal couple arrived together at the Cinema Society premiere of Gerwig’s “Damsels in Distress” on Monday, and “remained side-by-side in a banquette with pals all night,” said a spy at a Soho Grand Hotel after-party. The premiere was popular with the cast of “Gossip Girl” — Chace Crawford, Kelly Rutherford, Matthew Settle and Caroline Lagerfelt all made the rounds. Town & Country — which put the “Damsels” cast on its current cover — sponsored the bash for the film, a comeback after more than a decade for director Whit Stillman.