"It's unbelievable work that he's done there - I think he really championed a fantastic cause. I have nothing but admiration for him in doing that. I mean, he took it into his own hands too and he really shepherded that whole project and got a lot of important people involved." Leonardo Dicaprio praises Brad Pitt's work in helping to rebuild New Orleans, Louisiana after it was devastated by Hurricane Katrina in 2005.