Your friend recently moved to a large city. You are talking to her about her experience living in a larger city. You want to ask her if she's seen any famous people. You ask:
Have you spotted any celebrities?
Asking "Have you...?" is better than "Did you...?" when you are asking for general news about a person's recent life:
Have you lost weight?
Have you seen "Avatar" yet?
Have you called your mother lately?
You use the word "spot" to describe seeing something that's rare and difficult to see.
A good example of "spotting" is "bird-spotting", which is a hobby for some people where they try to see & identify different types of birds.
Another good example of "spotting" something is spotting a celebrity in a large city.
"Celebrities" are people who are famous nationally or internationally. They include movie and TV stars, musicians, etc.
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