The family found the incident amusing."It's hilarious," said Ms Nickelsen. "She does have short hair and similar colouring, but I love it that nobody thought, 'this is a child wearing a bright yellow dress' as opposed to what [George] had been seen in moments earlier."
Leila is Governor-General Sir Jerry Mateparae's niece. Her father, Stephen Grenside, is the brother of Sir Jerry's wife, Lady Janine Mateparae.
Ms Nickelsen said her daughter wasn't handling the bad weather well so she took her inside to the Governer-General's private apartment so as not to disrupt the royal engagement.
14-month-old Leila Grenside was mistaken for Prince George. Photo / Mark Mitchell
They enjoyed watching the Duke and Duchess' official welcome, unaware they were causing a stir.
"All we saw was the roped-off media area and just assumed everybody's attention was on William and Kate and the procession," she said.
The family remained unaware of their ill-founded brush with fame until Mr Grenside was told by his sister. "We just had a giggle, but it's very bizarre. I don't know if we should nickname her Prince George any time soon, but it'll be a neat story for her when she's a bit older," he said.