The world heard the news of Meghan Markle's pregnancy on Monday, but the royal family had a warning three days before.
When the extended family gathered at Windsor Castle to celebrate the wedding of Prince Harry's cousin, Princess Eugenia, the prospective parents could not contain their excitement.
Why use that occasion to spill the beans? "It was a happy family event, and that's where the happy news is shared," says a source close to PEOPLE in this week's cover story.
It is likely that they have already told Harry's brother, Prince William, and his father, Prince Charles, before the wedding. It is believed that Meghan's mother, Doria Ragland, was informed in person when she attended the launch of her daughter's charity cookbook last month.
To get a lot more about the baby news of Meghan and Harry and the royal wedding of Princess Eugenia, get a copy of this week's PEOPLE at the kiosks on Friday.
Experts say the babies' buzzing, which began slowly in late summer, was getting stronger and stronger and that the couple felt it would be very difficult to keep the pregnancy a secret during their 16-day Down Under tour.
When announcing the news before the tour, the couple has had the freedom to talk openly about it, from accepting baby gifts to taking a look at what is to come.
"That's so cute, it's our first baby gift!" Meghan said in PEOPLE's Live video on Facebook, while receiving a fluffy stuffed kangaroo (with a baby Joey!) And Ugg wool ankle boots during a reception in Sydney on Monday
At another reception later that day, Harry said, he thanked Australia for the "incredibly warm welcome" they had received and the "opportunity to meet Australians from all walks of life."
"We also really could not think of a better place to announce the next baby," Harry said, looking at Meghan. Appearing a little nervous, Harry added, "if it's a boy or a girl."