But while Mulroney may not be traveling with the royal couple in an official capacity, she still likely had a hand in Markle's wardrobe for her Australian tour.
"I love everything they stand for. As a human being you have so much to look up to with them", one young fan who had been waiting since before dawn told national broadcaster ABC.
"I made it with pasta and dipped them in gold paint and threaded the string through", he said.
"I'm not sure I will be good", she nervously laughed as she delicately threw the ball to one of the women.
After meeting huge crowds of well-wishers, the couple were treated to a fitness display in the grounds of the city's Government House.
Their day in Melbourne will also include a ride on a tram to South Melbourne beach, where they will meet members of the local life saving club.
Anyway, if it would improve your day to see sweet footage of a lovely kid pulling Prince Harry's beard, you can catch the whole clip below.
They are due to return to Sydney later this week for the opening of the global sports championship the Invictus Games, which was set up by Harry for wounded military personnel after his decade of service in the army.
Bookies are already betting on which name the royal couple will choose, with Diana, Arthur and Alice being the frontrunners, according to online gambling company BetFair.