Apparently the American public's love affair with Britney Spears isn't over: The singer just logged her sixth number one album, as her Femme Fatale sold 276,000 copies in its first week out. The sales put Spears into a tie with Janet Jackson and Maraih Carey as the third best-selling woman in Billboard history, behind Barbra Streisand and Madonna. Spears won big over her nearest competition: Weed-rapper Wiz Khalifa who released his Rolling Papers last week, and sold 197,000 copies. It was the biggest sales week of the year so far, overall, too. For more Billboard news, go to Billboard.