Julia Roberts joins the (other) Snow White Cast

It's not unusual for Hollywood to pit two movies with similar subjects against each other in the box-office arena. And release them almost at the same time no less. Examples of past occurrences :  "Armageddon" and "Deep Impact", "Antz" and "A Bug's Life", "Paul Blart: Mall Cop" and "Observe & Report". And in 2012 it will happen to Snow White. I've written about Kristen Stewart being cast as the