A live flub forced Dancing With the Stars cohost Alfonso Ribeiro to explain how routines are scored in the ballroom. After Mark Ballas and Secret Lives of Mormon Wives star Whitney Leavitt hit the dance floor during the season 34 premiere on Tuesday, September 16, the pair received positive feedback from judges Derek Hough and Bruno Tonioli. (Fellow judge Carrie Ann Inaba announced before the broadcast began that she was sitting out from the premiere due to illness.