Terri also wrote how happy the late Steve Irwin would be to hear of his daughters engagement, writing: "I am so very happy, and I know Steve would be too. Congratulations!!"
Chandler Powell popped the question on Bindi's 21st birthday after six years together.
Taking to Instagram to show off a close-up of the ring, Bindi wrote: "On my birthday I said ‘yes’ and ‘forever’ to the love of my life.
She added: "Chandler, close to 6 years ago I fell in love with you and every day since has been a whirlwind of adventure and true happiness. I’m so looking forward to spending our forever together as your wife. Here’s to a lifetime of friendship, purpose and unconditional love. Now let’s get married already!"
Chandler also shared the happy news with their fans, revealing some details about the special moment.
"Proposing in her very favorite place in the zoo, surrounded by animals, seemed like the perfect way to embark on this incredible new chapter in our lives. Bee, I love you more than anything in this world and I always will. Happy Birthday."
A number of celebrities took to the post to share their congratulations, including Millie Bobby Brown, who wrote: "Aww congratulations and happy birthday Bindi."
Australia Zoo added: "We’re so excited for you both! This is the best news ever!!"
While her younger brother Robert took to his Instagram to share a picture with the bride and groom-to-be, captioning it: "I am beyond happy for you two. You are true soulmates and have always been so completely perfect for each other. Love you both and congratulations."
The little girl who shot to fame as the world’s favourite Wildlife Warrior, following the tragic death of her father Steve, is all grown up.