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

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.

Steve Irwin Writes Touching Letter to Parents, Found Almost 10 Years After His Death

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