Keira Knightley doesn't go nude for no reason! The actress talks about the nude scenes in her film 'The Duchess' and says she wouldn't have done the scenes if she wasn't comfortable. "I detest unnecessary nudity and what it says about women in society."

Keira tells Glamour magazine, "I think you see a lot of films where, oh, yes, the woman gets her [breasts] out again and runs around naked for no reason. And you kind of go, Ugh, do we have to? [laughs.]"

In 'The Duchess,' Keira plays the role of Georgiana, the Duchess of Devonshire, who was the distant relative to the late Princess Diana.

Catch Keira's sexy scene in the film and read more about the star in the latest issue of Glamour.