“The X Factor” may go with a two-host format for its ongoing second installment. Following wild speculation that Khloe Kardashian is Simon Cowell’s top pick to lead the show, it is now reported that Mario Lopez will join her as a co-host. According to Perez Hilton, the sister of Kim Kardashian and the former “Dancing with the Stars” contestant are locked in to host the show. TMZ, meanwhile, said Corbin Bleu is also circling the gig, but he can only wait and hope that the negotiations with either Khloe or Mario fall apart to nab the job.