On Monday, Irwin appeared on Good Morning America to share the exciting news. "This is completely different than anything I've ever done in my life... I hope I'm able to inspire other to seize opportunities and make a difference," she said. "I just hope my dance partner, whoever it is, is very patient and likes animals!"
Irwin, 17, was just 8 when her father "crocodile hunter" Steve Irwin died in a stingray attack. She carried in her father's legacy with several projects including Bindi, the Jungle Girl on Discovery Kids.
Check out Irwin's video message about the season:
More of the Dancing cast will be announced throughout the week. Season 21 premieres on Monday, Sept. 14 at 8/7c on ABC.
Check out our tango lesson with Derek Hough!