* Did you mean "king of the *beavers*?" This is unlikely as Simon Cowell is a music industry executive and there's no connection between him and beavers.
* Is there a slang term you are referring to? "Beaver" can be slang for something else, but without more context, it's impossible to know what you're asking.
* Is this a joke? Perhaps you're trying to be funny by using "bevers" instead of something else.
If you could clarify your question, I might be able to help you better.