Dancing With the Stars is pulling out all the stops for its "20th Birthday Party" episode - and that means many familiar faces will be back in the ballroom. The Tuesday, November 11, live show will commence with a special opening number choreographed by former pro Derek Hough, who has won the most mirrorball trophies, before taking a seat at the judges table. Hough's routine will be set to a reimagined version of the iconic DWTS theme song.