There are some stars who look the same every time they hit their mark on the silver screen. Margot Robbie is not one of them.  Instead, the 26-year-old welcomed a physical challenge early on her career, shedding her Australian accent and piling on the diamonds and leopard print to play the "Duchess of Bay Ridge," Naomi Lapaglia, complete with a thick classic Brooklyn accent.  "I kind of do things all or nothing," she told Good Morning America's Lara Spencer of the role in 2013. "It's a really fun accent to do and it's actually easier to do coming from an Australian accent."  Despite any claimed ease, Robbie's portrayal was so convincing, new fans...