Outside the Opera House on Tuesday, Harry lingered longest with war widow Daphne Dunne, 98, whom he hugged as they chatted.
She moved towards an aide and a member of the crowd shouted out, "I'll look after it for you!", to which Mr Kerr added: "You might not get it back!"
Prince Harry and Meghan walk on the lawns at Admiralty House in Sydney.
"Good news this morning", Harry exclaimed as she beamed over the baby news.
After the speech, Meghan spoke to guests including Australian TV personality Eddie Woo, who said his own children - aged five, seven and 10 - require "a lot of energy", to which she replied: "We're ready!"
She said: "They both said they liked my poster - but they told me not to miss school again!"
As the Duke and Duchess of Sussex made their way past hundreds of fans, a cheer could be heard when Prince Harry spotted Mrs Dunne.
Hannah said: "I told my sister we would see Meghan today but I couldn't believe it when she came over to speak to us".
"So nice to meet you", said Meghan.
Meghan laughed: "Our first baby gift!"
Finishing off the conversation, Meghan noted: "Hopefully the next time we see you we will have our little one with us".
The Royal Tour wouldn't be complete without a visit from the woman who famously stole Prince Harry's heart. "And soon have a bubba", she said.
They then traveled across the harbor by boat to the Sydney Opera House. The sporting event, founded by Harry in 2014, gives sick and injured military personnel and veterans the opportunity to compete in sports such as wheelchair basketball.
But while the Duchess has been inundated with support from across the United Kingdom and her native America, there's one very stateside tradition that she's expected to miss out on.
Rumors had been circulating for weeks, and British media say they broke the news to Harry's family during his cousins' wedding last week.
IMF Chief Economist: Pakistan has not approached IMF
It maintained a 5.3% growth forecast for the Southeast countries in 2018, but lowered the 2019 estimate slightly to 5.2%. Mechanisms of multilateral global policy cooperation are under strain, notably in trade, and need strengthening'.