Pictures Forbes' Most Powerful Celebrities July 30, 2012 / 12:21 AM EDT / CBS News Photo Credit: Ethan Miller/Getty Images for Hyde Bellagio Oprah Winfrey Photo credit: Andrew H. Walker/Getty Images Justin Bieber Photo credit: MOHD RASFAN/AFP/GettyImages Rihanna Photo credit: AAS, ERLEND/AFP/GettyImages Lady Gaga Photo Credit: Graham Denholm/Getty Images Britney Spears Photo Credit: Jason Arthurs/Getty Images Kim Kardashian Photo Credit: Pascal Le Segretain/Getty Images Katy Perry Photo credit: MAX NASH/AFP/GettyImages Tom Cruise Photo Credit: Larry Busacca/Getty Images Steven Spielberg Photo Credit: Kevin Winter/Getty Images for AFI Taylor Swift Photo Credit: Ethan Miller/Getty Images Tiger Woods Photo Credit: Andrew Redington/Getty Images Angelina Jolie Photo credit: Dan Kitwood/AFP/GettyImages Donald Trump Photo Credit: Ian MacNicol/Getty Images LeBron James Photo Credit: Ned Dishman/NBAE via Getty Images Beyonce Photo Credit: Jason Merritt/Getty Images For BET Elton John Photo credit: SAMUEL KUBANI/AFP/GettyImages Simon Cowell Photo Credit: Danny Martindale/Getty Images Rush Limbaugh Photo Credit: Ethan Miller/Getty Images Tyler Perry Photo Credit: Michael Buckner/Getty Images