Actress Keira Knightley agreed to pose topless for an Interview magazine feature on one condition: She didn't want her body modified with Photoshop.

After her unedited shoot with fashion photographer Patrick Demarchelier hit newsstands, Knightley explained to the Times,

I've had my body manipulated so many different times for so many different reasons, whether it's paparazzi photographers or for film posters. That [shoot] was one of the ones where I said: 'OK, I'm fine doing the topless shot so long as you don't make them any bigger or retouch.' Because it does feel important to say it really doesn't matter what shape you are.

...

I think women's bodies are a battleground and photography is partly to blame.

Knightley's stance on photographic nudity may come, at least in part, from having been burned before.

"They always pencil in my boobs," she told Allure in 2012. "I was only angry when they were really droopy... For King Arthur, for a poster, they gave me these really strange droopy tits. I thought, well if you're going to make me fantasy breasts, at least make perky breasts."

Hence Knightley's new rule: No more fantasy breasts. Her policy regarding the real ones is slightly different, though:

"I don't mind exposing my tits [on screen] because they're so small — people really aren't that interested," she said in that same Allure interview.

But people are definitely interested. Her Interview shoot is all over Twitter and Facebook, and Interview's site seems to be bogged down from all the attention.

On the other hand, Knightley's anti-Photoshop stance may be driving more traffic than her naked breasts alone. The topless image has been online since August, but it only became a phenomenon this week.

[Photo: Patrick Demarchelier/Interview]