SPOILER ALERT: This story contains spoilers from the Tuesday, Nov. 11 episode of “ Dancing With the Stars .”

It’s official: “Dancing With the Stars” is in its 20s. Tuesday’s episode of Season 34 celebrated the anniversary of the reality competition series with returning favorites — from longtime host Tom Bergeron joining as guest judge to both original pros and past winners taking on the ballroom floor for the first time in years. Plus, the episode received the most votes of all time.

The show opened with a routine, choreographed by Derek Hough and set to a reimagined live version of the “Dancing with the Stars Theme.” Six original professional dancers from Season 1 joined the troupe: Alec Mazo, Ashly DelGrosso, Louis van Amstel, Jonathan Roberts, Charlotte Jorgensen and Edyta Śliwińsk

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