Bindi Irwin Honors Brother Robert On His Birthday, 'You Light Up Our Lives'

Robert Irwin is 19! His sister Bindi wanted to make sure his big day was celebrated, so she took to Instagram to post a sweet tribute to her younger, but taller brother.

"Happy Birthday to the taller Irwin sibling and greatest brother in the world," her post began. "You light up our lives with your hilarious sense of humour and kind heart. I see so much of Dad in everything you do and I know he would be beyond proud of you. We all are."

She concluded her tribute by thanking her younger brother. "Thank you for being such a good uncle to Grace and fantastic brother to me and Chandler. We love you and can’t wait to celebrate today!"

Robert thanked his sister for her tribute in the comment section, "Love you B 🧡😊 thank you!" Other fans and followers also took to the comments to share some birthday wishes for Robert. "You guys epitomize what a brother and sister relationship should be… Cheers @robertirwinphotography Happy Birthday…. ENJOY 🍰🍰," one person wrote. Another added, "Happy birthday Robert Irwin your dad would be proud of you on how much you grown continue on your path to protect wildlife."

Powell also shared a tribute for his brother-in-law's birthday. "Happy Birthday to my brother-in-law and Grace’s Funcle, @robertirwinphotography. You make the most of every day and find the fun in everything we do!" he began the caption of a photo of the two of them along with Grace. "Thank you for the one million laughs over the years. I feel lucky to call you my brother and friend. Here’s to more awesome adventures and epic waves caught together in the many years to come."

The brother/sister duo recently attended the Steve Irwin Gala Dinner in Brisbane, Australia, along with mom Terri Irwin, Bindi's husband Chandler Powell and daughter Grace. The event was to help fundraise for Wildlife Warriors Worldwide while celebrating Steve's legacy. Both siblings shared photos from the event on their Instagram pages.

"I love your family! Thanks for representing a loving, wonderful family for so many to look up to," one of Bindi's followers wrote in the comments of the carousel of photos. "Beautiful pictures and a very beautiful family. Your dad would be proud of all of you both your mom, your brother and you and Chandler too. Keeping his legacy going," said another follower.

Two weeks ago, the family honored the late "Crocodile Hunter" on Steve Irwin Day. Robert shared a tribute to his dad on Instagram. "Today is Steve Irwin Day. It’s a day to remember everything Dad was about - conservation, dedication, fun and family. It never ceases to amaze me what an impact Dad had on the world when I see people in every corner of the globe celebrating his life and legacy on this special day. ❤️"

Many of Steve's fans commented on the impact he made on the world. "Your dad was an utterly superb human. And his life force was so strong, so palpable, it’s no surprise it lives on beyond his physical death. I will always treasure the time I had with him, your mum, Bindi and you. And my god! Did he love you kids!!" one person wrote.

Another follower added, "Your father's passion set my heart into orbit for this planet. I have always been incredibly sensitive to animals and nature- seeing your dad on the screen as my 5 year old self, first time watching TV in America, I was simply consumed. He was and continues to be a constant reminder that being lukewarm about what you love is just not enough... you set that heart on fire and kindle it forever! Beyond thankful to see you, your sister and mom keep his spirit so very alive."