In this Screen Tests interview, 'The Imitation Game' actress Keira Knightley -- who is one of the cover stars of W’s February 2015 issue with her co-star Benedict Cumberbatch -- talks about her crush on Humphrey Bogart in Casablanca and Emma Thompson in Sense and Sensibility, crying over Much Ado About Nothing, Maleficent, and the Katy Perry movie Part of Me.

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Keira Knightley on How the Katy Perry Movie 'Part of Me' Made Her Cry | Screen Tests | W Magazine