Shift Ranking of July 1: World's Most Powerful Celebrities07/01/2013July 1, 20131. Oprah Winfrey ¦ 2. Lady Gaga¦ 3. Steven Spielberg¦ 4. Beyonce Knowles¦ 5. Madonna¦ Source: ForbesCopy link12.2012 DW Shift RankingAdvertisement