Britney Spears and Demi Lovato have been the subject of major media scrutiny in their day. Finally, the two new additions to X Factor 's panel are the ones doing the judging. Pop princess Spears, 30, and former Disney star Lovato, 20, replaced last season's Paula Abdul and Nicole Scherzinger. On Wednesday, they joined music producer L.A. Reid and X Factor executive producer Simon Cowell at the judges' table for their first taped audition show. (Live comes later.)