Oprah Winfrey, Lady Gaga and Beyonce star in this year's list of the most powerful celebrities.
Oprah Winfrey, Lady Gaga and Beyonce star in Forbes' list of the most powerful celebrities of 2013. The rankings are based on earnings, how often they are mentioned on TV and in print, their Internet presence and how they're viewed by American consumers. Here are the Top 20:
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