( CNN ) -- `` Dancing With the Stars '' is facing its biggest test this fall . The long-running ABC series has seen ratings tumble in recent seasons , and critics have taken aim at the show for being predictable and stale . As a result , `` Dancing '' will air just one night a week this season . But the show continues to persevere , and hosts Tom Bergeron and Brooke Burke-Charvet unveiled the 17th season cast Wednesday morning on ABC 's `` Good Morning America . '' Based on the list alone , the celebrities appear to be an upgrade from previous seasons , but will it be enough to revive interest in the show ? Here are this season 's `` Dancing '' celebrities : . Nicole `` Snooki '' Polizzi -- The `` Jersey Shore '' alum is now starring on MTV 's `` Snooki and JWow . '' She hopes to do better than `` Shore '' co-star Mike `` The Situation '' Sorrentino , who finished ninth in season 11 . Keyshawn Johnson -- So if the former NFL wide receiver and current ESPN analyst wins it all , will he ask Bergeron to `` give him the d**n ballroom '' ? Valerie Harper -- The TV sitcom icon was diagnosed with a rare and lethal form of brain cancer but has said she is feeling much better , and doctors have told her there is `` less evidence of cancer '' now . Brant Daugherty -- The actor played Noel Kahn on ABC Family 's `` Pretty Little Liars '' and Patrick Clarke on Lifetime 's `` Army Wives . '' Christina Milian -- The entertainer had a Top Five hit with 2004 's `` Dip It Low '' and was `` social media correspondent '' for NBC 's `` The Voice . '' Bill Nye -- America 's favorite `` Science Guy '' told The New York Times in 2008 that he was `` obsessed '' with swing dancing , going out to the dance floor up to four nights a week . Elizabeth Berkley -- She danced like a high school student on TV 's `` Saved by the Bell , '' then twirled around a pole ( among other antics ) for the film `` Showgirls . '' Hopefully she 'll find a middle ground on `` Dancing With the Stars . '' Corbin Bleu -- He danced up a storm as Chad Danforth in the `` High School Musical '' trilogy and was recently seen as Jeffrey King in the online relaunch of the soap `` One Life to Live . '' Amber Riley -- The actress announced this year that she would no longer be a regular on Fox 's `` Glee , '' where she 's played Mercedes Jones since 2009 . Bill Engvall -- The `` Blue Collar '' comic may have to give himself a sign if he exits early . Jack Osbourne -- The reality TV star hopes to do better than sister Kelly , who finished third way back in the ninth season . Leah Remini -- The actress briefly co-starred with fellow contestant Berkley on `` Saved by the Bell '' during the `` Malibu Sands '' era . Could we see a beach dance-off between the two ? The 17th season of `` Dancing With the Stars '' premieres September 16 . Tell us what you think of the new cast by writing in the comments below .
`` Dancing With the Stars '' has several surprising new cast members . Actress Valerie Harper will compete despite a cancer diagnosis . The show 's season premiere is September 16 .