Sarah Stephens was discovered when she won a model search in her native Australia. Just 18 years old, she's already garnered praise from Mario Testino, appeared in Italian Vogue and Numéro, and is expected to land a lot of runway shows when Fashion Week starts in September. She says her classmates were surprised by her success since in school she was always a "dag" (the Aussie term for a nerdy loner — she even played the bass clarinet in band). Watch and find out what she used to hate about the way she looked.