The Dancing with the Stars ballroom is celebrating two decades of fun.

Week 9 of season 34 of the competition , airing Tuesday, Nov. 11, is its special 20th Birthday Party celebration. Joining as a guest judge for the evening is former host Tom Bergeron .

The night will begin with an opening number set to a reimagined live version of the “Dancing with the Stars Theme” by Ray Chew. Choreographed by judge Derek Hough , the number will bring together the show's current pros and troupe, as well as six original pros from season 1: Alec Mazo, Ashly DelGrosso, Louis van Amstel, Jonathan Roberts, Charlotte Jorgensen and Edyta Śliwińska.

Then, the show will honor DWTS members who have died with a performance by pros Ezra Sosa and Rylee Arnold to “Always Remember Us This Way” by Lady

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