Scarlett Johansson is auctioning herself off - for a good cause. One lucky, financially-privileged person will get the opportunity to meet the 27-year-old actress at the red carpet premiere of her new film, "We Bought A Zoo."The event will be held in Manhattan on Dec. 12.

The auction, which takes place on CharityBuzz.com and ends Dec. 8, has an estimated value of $5,000. Proceeds from the auction will benefit the non-profit organization Blessing in a Backpack. Also open to a meet-and-greet for charity is Sean Penn, whom Johansson briefly dated earlier this year after her split from ex-husband Ryan Reynolds.
This isn't the first time Johansson has offered herself up for charity. Last year, she auctioned off a chance for four people to meet her on the opening night of her Broadway play, "A View From the Bridge," which aided the earthquake victims of Haiti.