It's alumni week on 'Dancing with the Stars'

LOS ANGELES, CA It's the first time the show has ever paired up two celebrities.

Pro Mark Ballas will choreograph the number.

Fatone and Rycroft were picked by fans to perform in a contest called Design a Dance. Viewers also chose the dance style, song and costume design.

The two will dance to "Rock and Roll All Nite" by Kiss.

Rycroft is a former Dallas Cowboys cheerleader who appeared as a contestant on "The Bachelor." Fatone was a member of boy band 'N Sync.

The season finale of "Dancing with the Stars" will air May 25.

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