Keira Knightley Shows Off Her Slim Frame at the Premiere of 'A Dangerous Method' in London

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Michael Fassbender, Keira Knightley and Viggo Mortensen Jan. 31

Michael Fassbender, Keira Knightley and Viggo Mortensen pose together at the UK gala premiere of 'A Dangerous Method' at The Mayfair Hotel in London, England on Jan. 31.

Keira Knightley turned heads today as she made her way down the red carpet in a stunning backless gown at the gala premiere of A Dangerous Method, held at The Mayfair Hotel in London, England. 

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The actress, as well as handsome leading men Michael Fassbender and Viggo Mortensen, star in the new film about how the relationship between Carl Jung and Sigmund Freud gave birth to the idea of psychoanalysis. 

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Keira and the Duchess of Cambridge, Kate Middleton, are sort of sporting the same slender body type lately, although, we don't know if this is a good or bad thing. Keira looks beautiful, but she is a bit slim, don't you agree?