TV Britney Spears Spellbound on 'X Factor' By Paige Mara Feigenbaum 4:07 PM PDT, October 31, 2012 FOX The X Factor goes live for the very first time this season tonight on Halloween. Britney Spears got in the holiday spirit, dressed as a witch. RELATED: 'X Factor' Mentors Meet Their Talent "You're casting a spell on my contestants," accused fellow judge Simon Cowell. "That's cheating."PHOTOS: Crazy Celebrity Halloween Costumes To see if Britney brews trouble on the panel, watch The X Factor tonight on FOX.