When two of London's savviest style stars, Sienna Miller and Keira Knightley, signed up to star together in The Edge of Love, it was always going to be all about the fashion. We cooed over their Forties get-ups as they filmed on location in Wales, and then waited with bated breath to see their various premiere looks. It was a close call, but our favourite of the bunch has to be Keira's purple strapless Erdem dress, which she sported for the London premiere. The corsage-embellished style was stunning, but it was the oh-so-chic up-do that really made us swoon.

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