Keira Knightley lights up London Film Festival at A Dangerous Method screening

Keira Knightley lights up the London Film Festival in a cross-my-heart dress at A Dangerous Method screening

12:18 AM on 25th October 2011

Slender: Keira Knightley shows off her slim frame in a black and grey Roksanda Ilincic dress at A Dangerous Method screening in London Slender: Keira Knightley shows off her slim frame in a black and grey Roksanda Ilincic dress at A Dangerous Method screening in London

Slender: Keira Knightley shows off her slim frame in a black and grey Roksanda Ilincic dress at A Dangerous Method screening in London

Form-fitting: The dress hugged the actress

Form-fitting: The dress hugged the actress”s delicate curves in all the right places

We love you! Keira borrowed a friend

We love you! Keira borrowed a friend”s jacket as she went round signing autographs for fans

Glamour girl: The combination of the dress and heels made Knightley look even taller than 5ft 7in

Glamour girl: The combination of the dress and heels made Knightley look even taller than 5ft 7in

Leading men: Knightley was joined at the screening by co-stars Michael Fassbender (left) and Viggo Mortensen (right)

Leading men: Knightley was joined at the screening by co-stars Michael Fassbender (left) and Viggo Mortensen (right)

What

What”s so funny Knightley shares a joke with director David Cronenberg

Passionate: Knightley plays Russian psychoanalyst Sabina Spielrein, who has an affair with Carl Jung (Michael Fassbender)

Passionate: Knightley plays Russian psychoanalyst Sabina Spielrein, who has an affair with Carl Jung (Michael Fassbender)