Keira's revealing evening dress shows there's even less of her than we thought

Keira Knightley was back on the red carpet tonight - and looking as rake-thin as she appeared in Venice last week.

And she didn't choose an evening dress to cover the shrinking frame that created as many headlines at the annual festival as the film in which she stars.

It was more revealing than ever - slashed open across her chest.

Keira's dress was slashed to reveal her chest

Keira is tipped for an Oscar nomination for her role in Atonement.

Tonight's appearance will have done nothing to shrug off the constant comment about her gaunt look.

Even the gathered layers of the dress couldn't hide Keira's skinny profile

This time she was on the red carpet in Leicester Square at the UK premiere of the film with co-stars James McAvoy and Vanessa Redgrave are also expected at the red carpet event.

Directed by Joe Wright and adapted from the wartime novel by Ian McEwan, it is being hailed as one of the strongest British films in years.

The dress was a confection of gathers, swags and knots

It is also being touted for the Golden Lion award for best film at Venice.

Knightley, 22, plays Cecilia Tallis, an upper-class beauty whose fledgling love affair with the housekeeper's son (McAvoy) is destroyed by a tragic misunderstanding.

Keira chooses to show off her gaunt body on the red carpet in Leicester Square