God I love this dress. And I love too that through the festival, she paced her wardrobe with the same strategic approach she would have applied to her judging duties...culminating in this spectacularly dramatic Dior Couture gown.
After all, please remember where she is. Nothing is as over the top and as excessive as the Cannes Film Festival. This is how your close Cannes properly. She brought it (almost) every night.