(CNN) Bindi Irwin hasn't been able to celebrate some recent major life milestones with her father, the late "Crocodile Hunter" Steve Irwin, but he is never far from her thoughts.

On Friday, she took to social media to share a touching note to him.

The wildlife conservationist gushed about her brother Robert Irwin , and revealed that he would be walking her down the aisle at her wedding.

"Dad, You'd be so proud of Robert. He's been such an amazing support during this new life chapter," she wrote. "I know you'd be beaming with pride when the time comes that he walks me down the aisle. I wish you could be here for these moments, but I know that your spirit lives on in us ❤️"

Dad,

You'd be so proud of Robert. He's been such an amazing support during this new life chapter.

I know you'd be beaming with pride when the time comes that he walks me down the aisle. I wish you could be here for these moments, but I know that your spirit lives on in us ❤️ pic.twitter.com/6TGHUU9MxH — Bindi Irwin (@BindiIrwin) August 2, 2019

Irwin and her longtime boyfriend, Chandler Powell, got engaged last week after he proposed to her at the Australia Zoo on her 21st birthday.

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