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A birthday is treated like a milestone. It happens only once every year but it certainly calls for some sort of celebration. It is supposed to be one of the happiest occasions in the life of a person. If you want to throw a great birthday bash then you might as well do it right. When it comes to throwing the best birthday parties around, no one can beat the way celebrities celebrate their own party. Celebrities know what to do. Check out the happiest of birthdays of todays’ most famous celebrities.