According to a report from E!, pop superstar Britney Spears has signed on to be a judge on the second season of the American television rendition of the "X Factor."  Of course, spokesmen for the Simon Cowell-produced talent show and Fox declined to comment.  A report surfaced several weeks ago that Spears and the show had come to terms on a $15 million contract but that final details still had to be finalized.  Fellow pop stars Miley Cyrus and Demi Lovato have also been rumored as potential judges for the "X-Factor," but the show and network have been less than forthright about those reports, as well.