Nicked this off the Sienna thread-
This is from nysocialdiary.com
As you know, producer Holly Wiersma has made us associate producers of Factory Girl, the film that details the rapid rise and sudden fall of Andy Warhol “superstar” Edie Sedgwick. So many actresses have been mentioned for the role, but we can no definitely confirm that Sienna Miller is back on board. (No, we didn’t even approach the subject of her wandering Jude when we spoke with her from her London home.) We started calling everyone associated with the Edie project and told them the wonderful news that Sienna is back.
Our friend Brigid Berlin, who’ll be playing Edie’s grandmother, was thrilled when we called her with the news, as were the film’s producer Holly Wiersma, director George Hickenlooper and writer Captain Mauzner. A few months ago when it was announced that Sienna had to withdraw from the film, some nasty rumors began to circulate that she was dropped in favor of Katie Holmes. An out-and-out lie!
The start-date of our film was delayed and Sienna had to honor the commitment she made to appear on the London stage in As You Like It. Then Holmes was in, then out, in the wink of an eye (this was during the “Tom and Katie Show,” if you’ll recall, which preceded the release of their summer films).
The movie’s cast is taking shape marvelously: Guy Pearce as Warhol, Sienna as Edie,
Hayden Christensen as “a rock star based on a composite” of three musicians with whom Edie was romantically involved. 
Brigid Berlin originally gained notoriety as “Mrs. Andy Warhol” and as a member of the Warhol acting troupe and she’s suggested that Maggie Gyllenhaal would be ideal to portray her. Speaking of Brigid, the other morning, at around six, we received our daily phone call from her with the comment on the report she’d just heard: that it is harder to get into some New York City or Hollywood night clubs than it is to get into this country. Said Brigid, “If Steve Rubell were alive, he would have made the best head of Homeland Security or Immigration. He wouldn’t have let anybody into this country unless they were cute.”
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