My Heart is My Own: The Life of Mary Queen of Scots by John Guy What it's about: Following the life of young Queen Mary after she is widowed at age 18, the biopic focuses on her relationship with rival Queen Elizabeth. Who's starring: Saoirse Ronan is starring as Mary Stuart opposite Margot Robbie as Queen Elizabeth I. Joe Alwyn and Guy Pearce also costar. Release date: Dec. 7th Image Source: Focus Features