When Worlds Collide: Celebrities Meet the Royals

Celebrities are often considered to be Hollywood royalty. They have massive fan bases, their public appearances can cause a frenzy, and they live lavishly with the money they make. They even sometimes receive gold for their work - in the form of statues and awards, of course. But what happens when they meet actual royalty? In the presence of queens, princes, and princesses, even the biggest names in the industry can get a little starstruck. Click through the gallery to see which celebrities have...