Want Keira's sexy green 'Atonement' gown?

In 2006, the iconic shirt/jacket hanging in Heath Ledger's closet at the end of "Brokebeck Mountain" was snapped up at auction by a thrilled film fan/gay activist.

This year, Keira Knightley's memorable green silk evening gown worn in "Atonement" will be auctioned off to benefit Variety -– The Children’s Charity of Southern California.

Clothes Off Our Back will host an online auction of the green gown from the epic love story, which has been nominated for seven Academy Awards, including best picture and costume design.

The auction begins Friday, Feb. 1, and ends on March 1. Bidding starts at $1,000.

The dress was one of several made specifically for Knightley. Multiples were needed because of the fragile nature of the dress, which got a little shredded on those tricky library shelves.

The gown has been authenticated by Jacqueline Durran, nominated for an Academy Award for "Atonement" costume design.

Go to Bravo to watch an exclusive interview with Keira discussing the film’s costumes, including that oh-so-sexy green dress.

Photo: Focus Features