Let's say you're in a perfectly average scenario, in an average place at an average time (not a big event where celebrities would be expected) and a person comes up and starts talking to you, and they look EXACTLY like a celebrity. Or maybe you've been in this very scenario. Which of the following would you/ did you say?
Or if you wouldn't say anything, answer the question as if this is just what you'd think to yourself? Point is, are you more likely to think you've seen the celebrity themselves, or just a look alike?