Robert Irwin marks 21st birthday with touching tribute to dad Steve: 'Hard to celebrate'

Robert Irwin has commemorated his 21st birthday by paying tribute to his late father, Steve Irwin. Robert turned 21 on December 1, saying it was "hard to celebrate milestones" when grieving the loss of his father.

Taking to Instagram to share photos of Steve on his 21st, Robert reflected on the milestone birthday, saying he was "lucky" to be surrounded by the rest of his family on his own 21st.

"Today I turn 21. I was looking through the archives a few days ago and I found these pictures of my dad on his 21st. It can be hard to celebrate the milestones when there’s someone missing, but I will carry his memory and passion with me in this new chapter of life. I am one lucky guy to be surrounded by my amazing family today," Robert captioned the post. "Time to celebrate!"

Bindi and Terri Irwin's birthday wishes for Robert's 21st

Bindi and Terri also both took to Instagram to share a series of snaps and videos for Robert's 21st birthday, with Bindi saying she was "beyond proud" of her brother.

"Best brother, best uncle, best friend," she said. "Here's to every incredible adventure on the horizon."

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Terri uploaded an old family video of the family acting out a skit with water guns. "Happy 21st birthday @robertirwinphotography! 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," she said.

"This is the BEST," Robert commented, with Bindi adding, "I remember this so vividly!! Such special memories. This trip was one of my favourites we ever did together."

Robert Irwin sends fans wild with Stellar magazine cover

In celebration of his 21st birthday, Robert was the cover model for Sundays' Stellar magazine, sending people in a flurry of fire emojis in the comment section.

"Zookeeper by day, model by night," one person commented. "Mate, you need a licence to carry those in Australia," another person commented, while someone else joked, "Mate relax, my mother is on this app."

Considering he's often seen in his khaki attire or on a red carpets, fans loved the stripped back look for Robert.

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"Always cute. Now handsome, shows his bone structure [and] good looks," one person commented. "Hot with a bit of Glen Powell vibes," another said. "Great to see this look for him!" another fan said, while someone else commented, "Gorgeous🔥".

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