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.
Speaking at her birthday party, Bindi said she wished her late dad could be with her as she celebrated the milestone, with the Crocodile Hunter’s image a strong presence on her big day.
"What gets to me are those moments when I’d love him to be here to share what we’re doing," Bindi recently told Stellar. "It could be when my brother is receiving an accolade for his photography, or it might be at the end of the day when we’re having dinner and laughing.
"I’ll think: 'I wish Dad was here for this.' But he’s just not there."
But family had plenty of support on her big day, with Terri holding centre stage during a press stop amid the celebrations, pointing out how precious time is, as she sees her daughter grow into a woman.