Although pretty much impossible to tell, we can always turn to Wikipedia.
In 2008 15% of articles were bases on "Biographies and persons" assuming each article was based on a notable person. In 2008 there was 2.25million articles wrote in English. Therefore, there was 337,500 famous people documented on Wikipedia. If we assume that that percentage has held true into 2012 then there should be 600,000 articles on famous people (written in English).
Sources:
http://en.wikipedia.org/wiki/File:Wikipedia_content_by_subject.png
http://en.wikipedia.org/wiki/File:EnwikipediaArt.PNG
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Impossible to say. Some one who one person thinks is a celebrity may be completely unknown to some one else.
2,000,000,000
well. there are many, many,many people named brianna devito in this world and at least 1 of them has to be a celebrity.
It is very difficult to count how many celebrities exist in the world. One of the first problems that one may run into is how they would define a celebrity. A list, B list can be somewhat subjective when it comes to certain personalities. There are celebrities who are regional, cultural or niche market (en.wikipedia.org/wiki/Celebrity). Then there are also numerous reality show and internet celebs. The first thing one would have to do in order to get an actual number of how many celebrities exist in the world is define for themselves the term celebrity and how they wish to count it. For instance; does someone who had a small part on a TV show 10 years ago but hasn't done anything since still considered a celebrity? If I had to guess I would say (conservative estimate) that there are literally tens of thousands of celebrities around the world. The estimate is around 600,000.
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