Comedian Andy Richter dance the quickstep Tuesday night on "Dancing with the Stars," but wasn't quick enough to avoid elimination as the series celebrated its "20th Birthday Party" this week.

The 20th Birthday Party on Tuesday night, Nov. 11, opened with previous and current pros dancing to the show's theme song. In addition to welcoming back former champions, longtime host Tom Bergeron returned as a guest judge and opened the show alongside current co-host Alfonso Ribeiro.

After the stars performed their routines, which recalled iconic dances from previous seasons, four stars earned perfect scores: "The Secret Lives of Mormon Wives," star Whitney Leavitt; wildlife conservationist Robert Irwin; TV personality Alix Earle; and reality TV star Dylan Efron.

The stars, except Leavitt, who

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