'X Factor': Will Demi Lovato or Miley Cyrus be fourth judge? Britney Spears may have some tabloid competition at "The X Factor" judging table, with troubled teen queen Demi Lovato possibly slated to join the singing show. Lovato, who checked in to rehab in 2010 to deal with bulimia and other issues, is in the final stages of a deal to join Simon Cowell's show, according to a Hollywood Reporter article published Tuesday. That could put the kibosh on "X Factor" interest in Miley Cyrus, another former teen singing sensation trying to navigate her way to a post-adolescent career. The gossip site Celebuzz reported the Cyrus angle as an exclusive Tuesday, but it appears no firm offer has been made to the former "Hannah Montana" star. Meanwhile, talks to bring Spears on board the show continue to drag on, as the "Toxic" singer has insisted on various perks that have bogged down negotiations, according to one agent familiar with the situation. A spokeswoman for "The X Factor" declined to comment. A rep for Cyrus did not immediately return an email seeking comment. Cowell, who will return as a judge this fall along with Antonio "L.A." Reid, fired Nicole Scherzinger and Paula Abdul as judges earlier this year, shortly after "The X Factor" wrapped its first season on Fox. Who do you think would make the best judges on "The X Factor"? Britney Spears joining "X Factor" for $15 million Fans react to idea of Britney on "X Factor" Paula Abdul axed in "X Factor" shakeup Photo: Demi Lovato may end up as the fourth judge on Fox's "The X Factor." Credit: Kirk McKoy/Los Angeles Times.