The story was first posted on a royal tumblr account, and resurfaced on a royal fan’s Twitter account.
According to a source who reportedly worked at the place where Kate and William stayed at the time, the now royal mother-of-three took some time before an official engagement to spend quality time with George and show him the kangaroos that were outside.
A note at the bottom explains the source of the story: "This anecdote was shared by someone whose mum knows someone who used to work where William and Kate stayed with George during their 2014 tour in Australia."
The story reads: "My Mum knows someone who used to work at government house in Canberra. When Kate, William and George were staying there, Kate came running (well, probably elegantly gliding) down the stairs with her hair, make up and jewellery done for the ball but still in casual clothes.
"She asked how long until they had to be dressed, because there were some kangaroos outside and she wanted to take George out to see. They sat on the grass and watched the kangaroos until it was time for her to get dressed."
As well as meeting some kangaroos, little Prince George also met a bilby who was originally named Boy but was renamed after George was born.