Justin Bieber will be assisting “X Factor” U.S. judge Antonio “L.A.” Reid in choosing contestants who will perform in the show’s live episodes in 2012.Bieber isn’t the only teen idol who is a guest mentor on “The X Factor” U.S. in 2012. As previously reported, Nick Jonas is assisting judge Demi Lovato (who is a longtime friend of his and a fellow ex-Disney Channel star) in the category of contestants who are 12 to 16 years old.
