The official Twitter handle of Kensington Palace, on Monday, made the announcement that the couple is expecting a baby in the Spring of 2019.
The Duchess was expected to rest for the first part of the day while Prince Harry undertook several engagements focusing on environmental issues, before rejoining her husband for a reception.
Harry and Meghan's 16-day royal tour will take them to Fiji Tuesday.
Royals Harry and Meghan go barefoot on Bondi
Meghan Markle and Prince Harry are said to want to want their children to live as normal as life as possible.
Harry and the former Meghan Markle also matched earlier that day (we're sensing a pattern here!) as they both donned black Invictus Games shirts to play with children and remote controlled cars.
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When she was a no show swapping cycling events in Sydney for a Sunday sleep in no woman who has ever borne a baby would have ever been surprised.
"If it has been a very late night due to unforeseen circumstances, we have to adjust for that".
"I can easily see that that is one of the things I will be talking to my grandkids and future generations about".
During his speech at the Invictus Games' opening ceremony in Sydney, Australia, over the weekend, Harry thanked the locals.
Hosted by Australian Prime Minister Scott Morrison, the couple joined Invictus competitors and their family members for a lunchtime gathering to hear more about the games.
The prince has appeared thrilled to have wife Meghan Markle by his side as the couple tour Australia as part of their first official overseas trip as a married couple.