Saoirse Ronan and Margot Robbie play royal rivals in the upcoming period movie Mary Queen of Scots . Ronan plays Mary and Robbie is Elizabeth. The movie is based on the book Queen of Scots: The True Life of Mary Stuart by John Guy. As the trailer suggests Mary Queen of Scots is about a friendship that turns into a rivalry and a rivalry that turns into a war. The movie's two leads are Academy Award nominees. Both Ronan and Robbie look stunning. However, the transformation of Robbie is unbelievable. Margot Robbie is literally unrecognizable in Mary Queen of Scots. The movie is slated for a December release. Mary Queen of Scots Cast Saoirse Ronan, Margot Robbie, Jack Lowden, Joe Alwyn, Gemma Chan, Martin Compston, Ismael Cordova, Brendan Coyle, Ian Hart, Adrian Lester, James McArdle, with David Tennant, and Guy Pearce. Mary Queen of Scots crew The movie is directed by Josie Rourke. The Writers are: Beau Willimon (“The Ides of March,” “Hou...