Between New York Fashion Week, the Grammys, and good old-fashioned model hijinks, it was a big week in the world of celebrity social media. Stars like Jessica Biel and Chrissy Teigen were on hand for music's biggest night, as was Karlie Kloss, who also shared lots of photos from her many runway appearances during Fashion Week. Fellow models Cara Delevingne and Coco Rocha were equally snap-happy — Cara goofed off with magnifying glass necklaces backstage at Tory Burch, while Coco posed with Diane von Furstenberg at the designer's Fall '13 show. Rachel Zoe congratulated Oscar de la Renta after his runway presentation, and Zac Posen talked to CNN's camera after his own big show. We also got a sweet look at good friends Kate Hudson and Stella McCartney staying close at the Elle UK Style Awards.