In September, Keira Knightley posed topless for Interview magazine -- and now she's revealing the seriously awesome reason why she chose to do so.

“That 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,’" she told the Times (quote via HollywoodLife). "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,” she continued. “Our society is so photographic now, it becomes more difficult to see all of those different varieties of shape.”

The 'Begin Again' actress looked stunning in the black and white shot, showing off her svelte figure in nothing but black pants and intricate black lace gloves. And most importantly, she was proud to flaunt her small bust and prove that beauty really does come in all shapes and sizes. Work it, girl! We love her message of body positivity.

You can check out Keira Knightley's gorgeous (but NSFW) Interview spread here.