Mumford will play the girl who was supposed to interview Christian Grey -- but had to send her roommate instead
EL James, entertainment media process the surprising news
Writer EL James tweets the news just after casting Dakota Johnson as Anastasia Steele
TheWrap was first to report that the daughter of Melanie Griffith and Don Johnson was tops in the running for the role
Former fan fiction author is estimated to have made $95 million last year
TheWrap has also learned how much Universal paid for '50 Shades of Grey' -- a whole lot less than Milchan offered
E.L. James, author of the "50 Shades of Grey" trilogy, explains how she chose to climb into bed with her new film partners Universal and...