"Watching The Tonight Show with Jimmy Fallon - right now! So excited to see my INCREDIBLE brother," Bindi wrote in the caption. "This photo was taken in the Green Room backstage! Are you watching with me?"
This was Robert's first time on the late night talk show, and he was the spitting image of his late father, Steve Irwin. From his eager charm to his reverence for conservation and all things wildlife, it’s clear to see that the apple didn't fall far from the tree.
The adorable Dancing With the Stars champ has always had a close relationship with Robert, often sharing heartwarming social media posts about her younger brother and how well he's honoring their father's legacy.
"Happy birthday to the greatest brother on earth," Bindi wrote to her brother after flying back to Australia for his b-day. "Being a big sister is the greatest job of all. I love you so much, Robert. And I'll be here for you forever." Check out the video below to hear more about their heartwarming connection.