In practical terms how would you define who should be given an exemption and how do you prevent abuse?  The advantage of the current system is its universality, it does not require any interpretation of who is and is not included. Who exactly is a celebrity? How do you define that and how do you insure that it isn’t used to cover the children of law makers and other influential individuals?  Celebrity, almost by its nature, is impossible to define and the moment you attempt to do so – ‘all professional singers’ for example – you create a loophole that people will rush through.