Bindi Irwin Pays Tribute to Her 'Crocodile Hunter' Father 10 Years After His Death

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Bindi Irwin continues to hold dear the memory of her beloved father.

Ahead of the 10-year anniversary of her father's death, Steve Irwin, the former Dancing with the Stars alum took to social media on Saturday to share a touching tribute.

WATCH: Bindi Irwin Opens Up About Anxiety After Dad's Death, Raves Over 'Old-Fashioned' Boyfriend: 'Het Gets My World'

"You'll be my hero for my entire existence. I love you more than words can describe," Bindi, 18, tweeted, alongside an adorable father-daughter baby photo.

Last month, Bindi celebrated her 18th birthday and shared another touching post on social media.

"Today marks 18 years of life for me, here in Australia and I really don't know where to begin in thanking so many people for an unforgettable journey so far," Bindi captioned the photo. "So I think that I'll start here, with this photograph."

WATCH: Bindi Irwin Pays Tribute to Her Mom and Late Father While Celebrating 18th Birthday: 'I Am Endlessly Grateful'

On Friday, Irwin's family released a heartfelt letter that the Crocodile Hunter wrote to his parents, Bob and Lyn. The note -- which will be published in Bob's upcoming memoir, The Last Crocodile Hunter: A Father and Son Legacy -- was tucked away in a book and was discovered earlier this year.

Written 12 years before his untimely death in 2006, the letter reads, "At 32, I am finally starting to figure it out. In good times and in bad, you were there. Your strength and endurance to raise me will not go unrewarded."

RELATED: Steve Irwin's Heartfelt Letter to His Parents Discovered: 'My Love for You Is My Strength!'

For more on Irwin's letter and upcoming memoir, available Oct. 25, watch the video below.