Factory Porn?In Factory Girl, Sienna Miller and Hayden Christensen might have engaged in not-so-simulated sex on camera. (Also, Diddy doesn’t want anyone taking pictures of him with Miller. Also, all Sienna’s partying is merely PR for Factory Girl.) The house that Graydon Carter threw scaffolding outside of yesterday? Harvey Weinstein’s. (Graydon’s also having a tough time selling his new documentary, Chicago 10.) Chuck Schumer has imaginary friends. Former Paramount exec Gail Berman and former ABC exec Lloyd Braun are starting their own production company. Harry Potter star Daniel Radcliffe is going to bare all onstage in a London play.