A Dangerous Method: Michael Fassbender, Keira Knightley and Viggo Mortensen at The Mayfair Hotel.
Look back at Miss Knightley's style evolution in the gallery below:
Shop below at MyDaily Store to find more beautiful backless dresses:
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Keira Knightley Is Beautiful In Backless Dress At A Dangerous Method Premiere
Keira Knightley Is Beautiful In Backless Dress At A Dangerous Method Premiere