Marie Antoinette, played by Kirsten Dunst, comes to France to marry the heir to the throne. She wears dresses and eats cake; he hunts stags and is too shy to do anything about producing more heirs. Eventually, they manage, there's a brief affair, and then the revolution starts and they leave Versailles. That's about it.
We hoped for a light, frothy, high-school story with vague hints towards historical events. What we got was almost a complete lack of story - Marie Antoinette does one proactive thing for the first hour and ten minutes, and that's to clap at the end of an opera.
I can see why this bombed.