Robert may have been third-wheeling, but his and Bindi's brother-sister bond is a particularly strong one.
Since their father Steve passed away in 2006, Robert stepped up and was the one to walk Bindi down the aisle on her wedding day.
"Bindi, you are the most amazing sister and friend, always there for me through it all and I just couldn’t be happier you found Chandler. And Chandler, I am so happy to now welcome you into our family as my brother. March 25 was a truly beautiful day!"
Chandler also shared some details into how he and his new wife are spending their first months of married life.
The 23-year-old former wakeboarder shared a photo of himself and Bindi at the Queensland zoo alongside one of their many furry friends.
"How we spend ‘koala-ty’ time together as husband and wife... Love the friendly #AustraliaZoo residents coming over to say, 'G’day'! We have the best wildlife family in the world," he captioned his post.
Bindi and Chandler officially became husband and wife in March, mere hours before the Australian government enforced a shutdown on weddings exceeding more than five people in attendance.
New Idea previously reported that the couple already have babies on the brain and are ready to start a family soon complete with a state-of-the art nursery at their home in the Australia Zoo compound.
“That includes painting the walls with their favourite animals – virtually every creature that’s housed in the zoo will be included and an abundance of crocodiles, wild birds, koalas and snakes,” the source explained.
“Bindi and Chandler want their new baby to be familiar with these beautiful creatures from the moment he or she enters the world."