Robert Irwin marks 21st birthday with touching tribute to dad Steve: 'Hard to celebrate'
Bindi and Terri Irwin have taken to Instagram to wish Robert Irwin a happy 21st, as the Aussie star reflects on his late ...
Robert Irwin shares unseen photos of late dad Steve Irwin to mark milestone 21st birthday
Robert Irwin marked his 21st birthday in the most heartfelt way — by sharing throwback photos of his late father, Steve Irwin ...