She is definitely not a celibrity because I am not sure that is a real thing. But she probably is a celebrity, because if she exposed herself while at a night club, yahoo.com would make a news article about it.
You mean like going undercover? Yes, a police officer can impersonate, it is a common tool of the trade. However, it could be very dangerous for an undercover cop to impersonate a real person that could easily be exposed and put them in danger.