Fox just officially announced that Antonio “L.A.” Reid, who resigned yesterday as chairman of Island Def Jam Music Group, will join Simon Cowell on the judging panel of The X Factor. “L.A. was my number one choice to sit alongside me on the show,” Cowell said. “In my opinion, he is one of the greatest ever music executives and of course a fantastic writer and producer. I am thrilled he has agreed to join the show, and for any artist auditioning, they know they have the chance to meet a true star-maker.” Auditions for X Factor begin March 27.