Princess Eugenie Can't Sparkle Like Meghan Markle Thanks To This Royal Rule

Twinkle twinke little tiar-a. How I wonder where you are-a? Princesses Eugenie and Beatrice may have been born princesses, but the world's favorite royal-by-marriage celebrities Kate Middleton and Meghan Markle have them beat when it comes to one regal perk: tiaras. Though the royal cousins to Harry and William love outlandish headgear, the don't don the sparkly accessories coveted by Disney fans everywhere. The reason? Royal protocol dictates that royal family members hold off on wearing tiaras...