Celebrities vs. royalty

What is the difference between a celebrity and a member of the royal family. Well - it all depends on which country you happen to be in. In England the Royal family are celebrities. Of course they still have other celebrities too... but the Royal family are celebrities. The Royal family are constantly splashed on the TV, newspapers, and in magazines. People 'stalk' the royal family for photos and information just as they do here in America with celebrities.
In America its all about the celebrities but sometimes the two worlds can mix when there is a big event. For example, with the wedding of William and Kate even though I don't watch the news regularly, I've seen the information on the American news channel and even in magazines.
So - is there really a difference between celebrities and royalty. Not really. Celebrities are those that got to where they are either by doing something spectacular (actor/actress etc) or by marrying or being the child of someone famous. The royal family are people that were born or married into it. The media and the public are both fascinated by the lives of these individuals and will do almost anything to know about them better.