Coco Rocha Challenges Zac Posen and Jay Manuel to a Pose-Off

Supermodel Coco Rocha threw a party to celebrate the release of her book, ‘Study of Pose: 1,000 Poses by Coco Rocha’, and she challenged her guests (that would be Zac Posen and Jay Manuel) to—what else?—a pose-off. Give it a try and share yours with @glamourmag #StudyofPose.