To cast Ellie, the mercurial female lead of Tramps, director Adam Leon auditioned more than 300 actresses. Then he met then 19-year-old Grace Van Patten. “A lightbulb went off,” he says. “She shifted the dynamics of the room.” In Leon’s charming romp, which premieres on Netflix today, Ellie gets caught in a caper gone wrong with an aspiring chef (Callum Turner). “We were running around New York and stealing shots in Grand Central,” says the actress, wearing Dutch braids, black jeans, and a gold David Webb choker at the Four Seasons in Beverly Hills. “The whole thing was a real adventure.”