The green dress Keira Knightley wore in Atonement is being auctioned for charity.

The famous 30s-style backless gown, created by costume designer Jacqueline Durran, is on sale on Hollywood's Clothes Off Our Back Foundation website.

All proceeds from the auction, which closes in 18 days, will go to The Children's Charity of Southern California.

Atonement is nominated for seven Academy Awards including Best Picture and Best Costume Design.

Keira, who lives in Battersea and went to Teddington School and Esher College, missed out on a best actress gong at the Baftas on Sunday.

The award was won by French actress Marion Cotillard for her role in La Vie En Rose.