Celebrities Posing With Royalty

When Worlds Collide: Celebrities Mingle With Royals

One Direction's Niall Horan met the queen at Buckingham Palace in March 2014.

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. On Tuesday, One Direction's Niall Horan got to meet Queen Elizabeth II at a special reception at Buckingham Palace for the Irish community. Click through the gallery to see Niall and more celebrities who have had encounters with royal subjects.