I don't like to mention names but most celebrities i have flown are fine. They get get on the plane, sit down and usually mind their business. They don't want to be bothered and enjoy their privacy. Some of the famous pilot types will sometimes come up front and ask questions about the aircraft. We typically get a written briefing about what each pax likes and dislikes along with requested catering items. My favorite pax types are the typical non famous businessmen. They are the less needy usually.