Keira Knightley stuns in a backless gown as she and joins glam Hannah Waddingham on set of Netflix's The Woman in Cabin 10 at Spencer Mathews' family estate in Scotland Daily Anyone else still thinking about Keira Knightley's backless green dress from Atonement, 13 years later? At the link in bio, our style editor examines why the backless trend became an unlikely Keira Knightley Joins Co Stars Ben Whishaw & Sarah Lancashire at 'Black Doves' Premiere in London: Photo 5103159 Adam Silver, Andrew Koji, Ben Whishaw, Black Doves, Ella Lily Hyland, Isabella Wei, Kathryn Keira Knightley cuts an elegant figure in a strapless dress while Shanina Shaik flashes her sideboob in a racy ensemble at as they lead the stars at Tod's Milan Fashion Week show Keira Knightley at Focus Features "Anna Karenina" Los Angeles News Photo Getty Images