"I love you with all my heart. Your legacy lives on."
Bindi and her husband Chandler Powell's daughter Grace Warrior Irwin Powell will turn 1 next month. Grace's two middle names were chosen as a tribute to Steve's legacy as "the most incredible wildlife warrior".
Bindi named her daughter Grace Warrior Irwin Powell. The middle names are in honour of Steve. Photo / Instagram
Tuesday also marked what would have been Steve's mother's 80th birthday.
Lyn Irwin and her husband Bob founded what is now known as Australia Zoo in 1970.
Following in her family's footsteps, Bindi is a keen wildlife conservationist and has continued to honour Steve throughout her life.
Last month, Bindi shared that she had acquired a new tattoo in honour of Steve and Grace.
On the inside of her left wrist, she has the words "graceful warrior" tattooed in Steve's handwriting, next to an illustration of a crocodile.
"The words I spoke to our daughter as I held her for the first time in my arms were, 'my graceful warrior'. That's how her name was born," Bindi wrote on Instagram, sharing pictures of her new ink.
"This is my dad's handwriting to keep him with me, always.
"Our dear alligator, Daisy, is next to these words to represent our conservation work as Wildlife Warriors."