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LAS VEGAS, NV - MAY 19: Madonna poses in the press room during the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Jason Merritt/Getty Images)

Top 10 Most Powerful Stars

See where Oprah Winfrey, Taylor Swift, Justin Bieber, and more land on the 2013 edition of Forbes's annual Celebrity 100 list.