Keira Knightley is donating the dress she wore at the London premiere of the new Pirates of the Caribbean film to charity. The generous actress wore the revealing gold Gucci gown on the red carpet before taking her seat to watch 'Dead Man's Chest' last Monday.

Keira, who was criticized for looking too thin in the dress, is now giving the lavish garment away because she doesn't think she will wear it again. She said: "I'd like to give it to charity for them to sell. It's not the kind of thing you can get away with wearing twice."

It is the second time the 21-year-old star has donated one of her glamorous garments to a good cause. Earlier this year, Keira raised over £4,000 for Oxfam when she auctioned off the stunning Vera Wang dress she wore to the 2006 Oscars on eBay.

Keira said at the time: "It's brilliant that this dress has raised this much, I know it will go a long way to help the people facing the food crisis in East Africa. All of us can do something to support Oxfam's fantastic work and it will make a real difference."

-See photos of Keira.