Although longtime favorites—Chanel Iman, Emily DiDonato, Jourdan Dunn—are officially at the U.S.'s drinking age, there's a new roster of 18-20 year-old models whom we can awkwardly yet legally feel attracted to. Beyond looks, it's amazing how successful these girls' careers are at an age where most people haven't accomplished much of anything. Models like Georgia Jagger, Charlotte Free, and Karlie Kloss travel the world, debut couture collections on the runway, and cover the top fashion magazines. You have to respect it, and the fact that all of them are amongst the most beautiful women in the world doesn't hurt either. The 21 Hottest Models Under 21.