Scarlett Johansson is not just a beautiful actress. Well, she’s mostly that, but she’s also an ambassador for the charity Oxfam. I think they do stuff with food. As part of her charity work, Ms. Johansson announced today that she will be auctioning off two tickets to the 2010 premiere of a little movie called “Iron Man 2″. The winner of the coveted seats will also get a chance to chat up the Black Widow in a personal meet-and-greet before the show. Find out how to get your hands on Johansson’s…tickets after the jump.