A palace spokesperson said that Ragland said she is "is very happy about this lovely news and is looking forward to welcoming her first grandchild".
The Duke and Duchess were at the beach to learn about the BeachPatrol program, clearing Melbourne's shores of litter to reduce the negative impact on the environment and food chain.
On Thursday, the Duchess of Sussex, who announced Monday she and husband Prince Harry are expecting their first child, tossed an Australian rules football around during the third day of the royals' global tour.
The duchess brought with her for tea a homemade loaf of banana bread that she reportedly made in the kitchen of the Admiralty House in Sydney, where she and Prince Harry are staying.
Prince Harry and Meghan abandoned their strict schedule and instead spent 25 minutes meeting royal fans.
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A local said officials had told parents to collect their children from schools and kindergartens in the city for their safety. Photos from the scene posted by Kerch.FM showed debris on the ground and windows of the building blown out.
Some members of the crowd sang Stand By Me - a song the couple chose for their wedding service in May. "So what you and I can't get away with, my lovely friend can".
"She'd never seen cotton used in flower arrangements before so when someone handed her a bouquet with cotton in it she turned to one of her minders said how attractive it was", she said.
Prince Harry and Meghan announced that they are expecting their first baby together earlier this week, and the mum-to-be showed her blossoming baby bump for the first time during the event in Melbourne. That's a pretty incredible thing for anybody to do. According to the cafe, the entree consisted of a "mushroom and quinoa nest and chargrilled kangaroo, and main courses of wild boar, saffron risotto and barramundi".
The couple had lunch at the social enterprise restaurant Charcoal Lane, prepared by young indigenous chefs.