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The photos show Steve Irwin sitting at a dining table, cutting into a birthday cake covered with candles.

Robert Irwin's family also shared tributes for him on his special day.

His mom Terri Irwin wrote in an Instagram post, \"Remembering all our fun family moments, and knowing your dad would be so proud of you. I love you, and I can't wait for the adventures to come.\"

\"PHOTO:
Brendon Thorne/Getty Images
PHOTO: Robert Irwin attends The TikTok Awards 2024 at Hordern Pavilion in Sydney, Australia, Nov. 27, 2024.
>

Robert Irwin's sister Bindi Irwin, meanwhile, called him the \"best brother, best uncle, best friend\" in a sweet Instagram post of her own.

\"Here's to every incredible adventure on the horizon,\" she continued. \"Love you so much and beyond proud of you.\"

Robert Irwin's brother-in-law Chandler Powell, who is married to Bindi Irwin, also shared a birthday tribute to the 21-year-old on Instagram.

\"Happy birthday, @robertirwinphotography 🎉 Between surfing, working with crocs, and occasionally modelling hats, I think this year is going to be fantastic,\" Powell wrote alongside a photo of the two wearing Australia Zoo baseball caps. \"Can't wait to celebrate today! Thanks for being an awesome brother.\"

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