“Extra” host Maria Menounos has a secret as she rehearses with dance partner Derek Hough for week two of “Dancing With the Stars.” Word on the show is Maria broke a rib during a hard-core rehearsal with Hough, who was teaching her the Cha-cha-cha. A source close to the “Extra” host says “she has been in excruciating pain for the past few weeks during rehearsals, but she is staying strong and working through it. She refuses to give up.” We’re told Menounos is even hiding a rib brace underneath her sexy gear. We also hear Maria has become close to Hough and the pair have been seen out for dinner and at a Lakers basketball game rooting for Maria’s favorite team, the Celtics.