As Coco Rocha adds the Sass & Bide Spring '13 campaign (and her social media takeover) to her ever-growing portfolio, a slew of top models are popping up for the season, too. See, February isn't so bad, is it? Now we get to see Joan Smalls smolder for Prabal Gurung, Kate Upton sex it up for Sam Edelman, Erin Heatherton pose for XOXO and Alexa Chung return to Maje. Let's take a look—and be sure to stop by Sass & Bide to see what Coco is up to.