Every model has her thing: Karlie Kloss's walk, Cindy Crawford's mole, Daria Werbowy's legs. The feature of the moment is Cara Delevingne's eyebrows. The 19-year-old British model hit every major runway last season and those bushy brows—the best to hit billboards since Brooke Shields's—turned her into fall's number one face. Sure, after years of shaping and tweezing it can be hard to score such bushy brows, but it's a lot easier than gunning for Daria's legs. We turned to the women managing some of the world's best brows—Kristie Streicher who works on Rachel Weisz and Emily Blunt, and Kate Lee who's responsible for Keira Knightley and Rooney Mara—for tips on growing them out, filling them in, and achieving Cara-level fullness.