Leonardo DiCaprio and a young friend chatted in their courtside seats watching the Lakers defeat the Jazz in LA last night. Leonardo's an avid Lakers fan, but another of his most important passions is taking center stage now. With Earth Day coming up in a week, the actor is launching an eBay auction to support Global Green — prizes include a chance to attend the Shutter Island premiere, Titanic memorabilia, and other items signed by Leo. It kicks off tonight and ends next Wednesday evening. The environmentally conscious actor isn't the only one getting ready for Earth Day — check out our eco coverage across the network.