Meghan and Harry looked a bit shocked!
The duke and duchess then went on to a reception at Government House.
"You are the salt of the earth, honest, hardworking and as tough as they come", he said.
"But you need to know that part of being strong and tough is having the courage to ask for help when you need it".
Meghan and Harry diligently inspected a scaled miniature Formula 1 auto designed and made by Trinity Grammar students, but as the mini vehicle zoomed down a makeshift track, Meghan jumped and covered her mouth, before nervously bursting into laughter.
Some members of the crowd sang Stand By Me - a song the couple chose for their wedding service in May.
"He offered to stay for two weeks so we could have some more of the rain".
"I gave it to her for the nursery", she said.
Pregnant Meghan, 37, cooked the delicious treat in the kitchen at Sydney's Admiralty House, the mansion home of the Governor-General of Australia, on Tuesday night following her first full day of engagements during the royal tour.
She reportedly added that they were yet to decide on any names because they still had a lot of time to choose, according to 12-year-old Ella Burns, who told reporters, "She said that she hadn't thought of one as it was still quite early".
Van Dartel said she was initially anxious, as they had been told the children were not allowed to touch the royals at all.
The adorable boy also wrapped his arms around the Duchess and handed her a bunch of flowers.
If you're finding it hard to understand the hype about those royal people touring Australia at the moment, you're not alone - this child was so unfazed by the meaningless concept of royalty that he actually just skipped the whole pleasantries thing and grabbed Prince Harry by the beard.