The Duchess had returned to Admiralty House in Sydney on Oct. 16 after a day of events which saw her visit Taronga Zoo and greet crowds at the Sydney Opera House.
At the afternoon reception, Meghan could be seen chatting to music star Missy Higgins who was there with her daughter.
The Australian singer-songwriter welcomed a little girl, Luna, earlier this year.
Meghan also spoke to mathematician and Australian TV personality Eddie Woo, 33, at the reception where conversation turned towards parenthood.
The Duchess of Sussex has said she and her husband are “excited” about becoming parents.
When he said that his own children – aged five, seven and 10 – require “a lot of energy”, she replied: “We’re ready! We’re excited to join the club.”
Former Suits actress Meghan looked stunning in her olive green outfit from designer Brandon Maxwell, which retails for $2,555AUD.
Brandon Maxwell is an American fashion designer, director, photographer, and stylist who, since 2012, has acted as Lady Gaga’s fashion director.
Meghan accessorised her dress, which featured a pleated skirt, with nude shoes.
"Green is one of Meghan’s go to colours which looks sensational with her skin tone," Fashion expert Donny Galella told New Idea.
"I love her casual swept up up do with signature loose strands of hair," Donny told New Idea.
"The look is much like her wedding hair style."
Speaking previously to Daily Mail, Karen Haller, an applied colour psychology practitioner said Meghan favours green "if she is feeling a bit apprehensive or unsure".
"Let’s face it who wouldn’t feel like this joining the royal family and learning all protocol - this specific hue would go some way to providing her with a feeling of safety and reassurance, helping to create a sense of peace and balance," she added.
Earlier in the day, Meghan wowed in a fitted dress by designer Karen Gee.
The “Blessed” dress, which sets buyers back 1,800 Australian dollars (£977), is described as a “timeless classic” which features a “simple, structured fit designed to contour the body for a sleek silhouette”.
Ms Gee, who is based in Sydney, said it was a “wonderful surprise” to see Meghan in one of her designs – although had been aware it could happen after submitting several pieces for consideration.
“I can’t describe it as anything other than an honour for the brand to be recognised by someone who really exemplifies our values and the epitome of modern glamour,” she said.
At an afternoon reception hosted by the Governor General and Lady Cosgrove at Admiralty House, Prince Harry started a speech with “G’day your Excellency, ladies and gentlemen.
“It is obviously great to be back in Australia and even more so because this is my wife’s first visit here, so I’m very excited to show her this wonderful country of yours.
“Australia is of course home to some of the world’s best sporting talent, but what you are about to see at these Invictus Games will, quite literally, astound you.
“A demonstration of the power of the human spirit, the power of sport to change lives and the power of feeling part of all of this from the stands.
“There really is something for everyone.
“Thank you Your Excellency and Lady Cosgrove for giving us your magnificent home for the week. We are inviting all of our mates in Sydney…
“Finally, we are both absolutely delighted to be here," Harry said.
"We are really impressed to see you serving beer and tea at an afternoon reception in true Aussie style.
“We couldn’t think of a better place to announce the upcoming baby.”