In the comments, everyone wished Grace a happy birthday. “Omg! 4 already!! Oh they grow up so fast! Wishing your little warrior a very Happy Birthday!! Blessings on you Grace!!!” one person said.

Happy birthday, Grace Warrior! The daughter of Bindi Irwin ... Never miss a story — sign up for PEOPLE's free daily newsletter to stay up-to-date on the best of what PEOPLE has to offer ...