Len Goodman, Carrie Ann Inaba and Bruno Tonioli were the original Dancing With the Stars' judges - but they aren't the only stars who've weighed in on the contestants' performances. The show debuted in 2005 and while the trio remained the centerpiece of the judging panel for decades, various celebrities have appeared in a guest capacity. Julianne Hough made DWTS history in 2014 when she became the first star to permanently join the judging panel bringing the total from three scorecards to four.