The movie star walked the red carpet last month (Nov12) in a sheer, lace Zuhair Murad gown, and she is now giving one lucky superfan the chance to own it.
Stewart, who also autographed the dress, has decided to hand over the garment to charity officials behind the 12-12-12 Auction for Sandy Relief.
The sale follows the actress' appearance at the 12-12-12 Concert for Sandy Relief mega gig at New York's Madison Square Garden last week (12Dec12), when she called on viewers of the televised show to keep donating to help those worst hit by October's (12) storm, which caused devastation across America's East Coast.
Bidding on the strapless gown had already reached $1,750 (£1,094) as WENN went to press. The auction ends on Thursday (20Dec12).
Other items up for grabs in the CharityBuzz.com sale include limited edition guitars signed by 12-12-12 performers including Bon Jovi, Sir Paul McCartney and Bruce Springsteen, a signed sweatshirt worn by Kanye West, and the drumsticks rocker Dave Grohl used as he staged a Nirvana reunion with McCartney as their frontman.
All proceeds will benefit the event's charity, The Robin Hood Foundation.