Video and photo of the child patting the prince's hair and rubbing his little hand on his beard are melting hearts online.
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.
Samantha also said that "a baby changes everything and softens everyone" and she hopes there will be "some adjustment" to include her father.
"Prince Harry just hugged me", an overwhelmed Brown, who was shaking and crying, said.
Megan handled the pigskin like a pro though, eventually tossing it around with other guests at the shindig - but we suspect her blue heels are NOT regulation.
"It was more than what I imagined, it happened in such a flash, just unbelievable", Jasmine said. Not only did they get to hang out with some baby koalas at the zoo, but they also caught a ferry to the Opera House, where they watched a rehearsal by the Bangarra Dance Company.
Meghan shows off her Australian Football League (AFL) skills.
Among those present were students from Trinity Grammar, who gave the couple a rundown on their award-winning miniature F1 cars.
Meghan, Duchess of Sussex (left) and her half sister, Samantha Grant (right). Until now, Meghan has been dressed in loose-fitting shirts and coats, but the chic Dion Lee dress she wore during a day of engagements showcased her neat bump to perfection.