The actress and 12 other celebs, including Britney Spears and Kellan Lutz, have cleaned out their closets and contributed pairs of jeans to the auction, which is designed to raise awareness about textile recycling and help the program collect its one-millionth piece of denim.Blue Jeans Go Green has diverted over 600 tons of denim from landfills since 2006, and has utilized the denim for insulation