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'Dancing With the Stars' season 17 cast

The ballroom beginners set to battle for the mirror-ball trophy this season include Valerie Harper, Bill Nye "The Science Guy" and Nicole "Snooki" Polizzi.

He's already proved himself a triple threat on-screen in Disney's "High School Musical" series, and the 24-year-old will now get to prove his ballroom merit with Karina Smirnoff. Craig Sjodin / ABC
Despite an ongoing battle with terminal cancer that her doctor only recently revealed to be "pretty close to a remission," Harper will be part of the season 17 cast. The 74-year-old will be joined by returning pro dancer Tristan MacManus. Craig Sjodin / ABC
Actor, television host and all-round "Science Guy" Nye, 57, will groove with "Dancing" first-timer Tyne Stecklein. Craig Sjodin / ABC
The 25-year-old reality TV star will follow in the footsteps of her former fellow "Jersey Shore" cast member, Mike "The Situation" Sorrentino," by taking the "Dancing" stage. She'll work with former Troupe member and first-time pro Sasha Farber. Craig Sjodin / ABC
The "Pretty Little Liars" star, 28, will waltz with Peta Murgatroyd. Craig Sjodin / ABC
The 27-year-old actress and singer, best known for her role as Mercedes Jones on "Glee," will learn from "Dancing's" only four-time champ, Derek Hough. Craig Sjodin / ABC
The 31-year-old actress, singer-songwriter and social media correspondent for "The Voice" will dance with two-time pro winner Mark Ballas. Craig Sjodin / ABC
Actor-comedian Engvall, 56, will move to the music with newbie pro Emma Slater. Craig Sjodin / ABC
The 41-year-old film and television star behind memorable parts in "Saved By the Bell" and the now-cult classic "Showgirls" will hit the floor with Val Chmerkovskiy. Craig Sjodin / ABC
The retired NFL wide receiver, 41, will learn the ballroom basics from Sharna Burgess. Craig Sjodin / ABC
The 27-year-old reality TV star, who was diagnosed with multiple sclerosis in 2012, plans to show fans his dance-floor skills alongside two-time champ Cheryl Burke. Craig Sjodin / ABC
The former "King of Queens" actress, 43, who made headlines when she left the Church of Scientology earlier this year, will learn the steps with hoofer Tony Dovolani. Craig Sjodin / ABC