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"Dancing with the Stars" turns 100 on Tuesday, May 6, and the show will celebrate with the return of several of its alum. Season four champs APOLO ANTON OHNO and JULIANNE HOUGH will perform an all-new dance, as will season five finalists MEL B. and MAKSIM CHMERKOVSKIY.

Also returning is MARIO LOPEZ, who will perform a number from his Broadway show, "Macy's Stars of Dance" Presents A Chorus Line.

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