As the surly but kind young doctor on “Grey’s Anatomy” (ABC, 2005 - ), Justin Chambers seem so in his element that it’s hard to believe that he struggled for ten years before becoming a star. An extremely attractive male model perhaps best known for his Calvin Klein ads, Chambers made the transition to film acting gradually building a resume of work in small TV roles before breaking in to features. The tall, brown-haired, brown-eyed Chambers grew up in Springfield, Ohio, one of five children (he would eventually become father of five as well). The striking stud was spotted by an agent in a