'Dancing With the Stars' premieres Mon., Sept. 21 on ABC.
Check out season 9's full roster below.
Donny Osmond, Singer
Mya, R&B singer and actress
Michael Irvin, Former NFL wide-receiver
Melissa Joan Hart, Actress ('Sabrina the Teenage Witch')
Kelly Osbourne,Singer
Debi Mazar, Actress ('Entourage')
Chuck Liddell, Light heavyweight champion
Natalie Coughlin, Olympic gold medalist in swimming
Joanna Krupa,Swimsuit model
Aaron Carter, Singer
Tom DeLay, Former House majority leader
Kathy Ireland,Model
Ashley Hamilton, Actor, son of former 'Dancing' contestant George Hamilton
Mark Dacascos, Actor, host of 'Iron Chef America'
Louie Vito, Pro snowboarder
Macy Gray, Grammy-winning singer