The 23-year-old actress - who plays Georgiana, the Duchess of Devonshire, in period drama "The Duchess" - is "proud" of her modest assets and didn't want them changed in any publicity shots.
A source said: "She has insisted that her figure stay in its natural state. She is proud of her body and doesn't want it altered. But she looks flat-chested throughout the whole movie."
Keira's decision comes after her breasts were enlarged for posters and in publicity stills for her 2004 movie "King Arthur."
She said at the time: "Those things certainly weren't mine! I was like, 'OK, fine. I honestly don't give a s**t!' "
Keira - who is dating her 'Pride and Prejudice' co-star Rupert Friend - previously revealed she would like to have larger breasts, adding: "I would love to have boobs! I'm never going to get them. I'm naturally who I am."
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