US X-Factor starts Sept 12

Fox has announced the premiere dates for Britney Spears' and Demi Lovato's debuts as judges on "The X Factor." The second season of Simon Cowell's singing competition show will get a two-night premiere on Sept. 12 and 13. Spears already has been generating headlines during the audition tapings, with reports coming out about how tough a judge she is (a surprise to many).