Bindi Irwin celebrated her 18th birthday on Sunday by sharing a photo of her mother and late father, Steve Irwin.
Bindi's Instagram caption touched on the loss of her dad, but also explained how grateful she is for the love in her life:
"Our Dad, Mum's soulmate and a superhero for us all, passed away. However, since this photo was taken, 18 years ago, one life ingredient has remained, unchanged, unbreakable... I don't think that when this photo was taken even my beautiful parents could have known what life would evolve. I know that I am endlessly grateful for the love and light I have been given since Day 1 of my life."