PARIS (AP) ??? American movies are taking center stage at the Cannes Film Festival, with a fistful of U.S. films and stars including Brad Pitt and Jessica Chastain in the 2012 line up announced Thursday.Among some of the most anticipated titles of the year is an adaptation of Jack Kerouac's Beat classic On the Road.it is one of 20 films battling for the May 16-27 festival's coveted top prize, the