'Scream 4': Hayden Panettiere, Rory Culkin join slasher flick

hayden-panettiere-rory-culkin-scream-4.jpg"Scream 4" has added a couple more new cast members to the crew -- "Heroes" star Hayden Panettiere and Rory Culkin ("Signs," "Igby Goes Down"), according to Variety. They join Emma Roberts ("Nancy Drew") as the newcomers who will fight alongside franchise favorites Neve Campbell, Courteney Cox and David Arquette as Sydney Prescott, Gale Weathers and Dewey Riley, respectively.