The couple is scheduled to visit Tonga on Thursday before returning to Sydney on Friday night for the final days of the Invictus Games, Harry's brainchild and the focus of their tour.
She clasped her hands across her stomach, highlighting her small bump.
The royals have been touring Australia for the Invictus Games, a multi-sport event founded by Harry for wounded ex-service personnel, which is now under way in Sydney. Following a busy week of engagements, the castle reported late on Saturday that the Duchess of Sussex would cut down her schedule.
Days later, Meghan arrived on Australia's Fraser Island wearing an & Other Stories printed maxidress almost identical to her sister-in-law's, save for its cap sleeves.
"But the duchess was very keen to re-join the duke at the last engagement of the day to greet the people of the island".
The newlyweds are on Fraser Island, where Meghan was seen cradling her baby bump.
That includes a reception held by The President of Fiji at Borron House and an official welcome ceremony which will mirror in format that of the one attended by The Queen and The Duke of Edinburgh in 1953.
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Harry quickly responds, "so do I", before walking off.
The Duchess will attend a morning tea at the British High Commissioner's Residence and hear about a United Nations Women's project, Markets for Change, which promotes women's empowerment in marketplaces throughout the Pacific.
But Meghan isn't the only one excited about parenthood.
The Duke and Duchess of Sussex stayed in a tree-top villa on Fraser Island, also known as K'gari - paradise. Andrews added that the "Fijian blue" of Meghan's dress is a "tribute to her hosts".