The Duke and Duchess of Sussex will both speak at the ceremony this evening.
Thousands of people turned out to wish them well as they visited Sydney's famous Bondi beach and Opera House, drought-stricken Dubbo in NSW's west, Melbourne, and the sandy shores of Queensland's Fraser Island.
Prince Harry told veterans at the closing ceremony that was what mateship really looks like.
The boat neckline, the sleeve length, the material, the fit - the dress is practically identical to Meghan's one.
A Government House representative later said it was a false alarm caused by a vegetable steamer in the kitchen.
Meghan paid a moving tribute to the bravery of all the athletes involved in this year's Invictus Games in an emotional speech, sharing a treasured memory with the crowd in Sydney.
Following the Australian leg, they traveled to Fiji, where their royally fun excursion continued.
Fire communication shift manager David Meikle said it was unclear what caused the alarm to go off.
The parents-to-be likely didn't have too much time to spend in Vatuvara, as they've already made their way to the Kingdom of Tonga.
"I can't believe this has happened, I can't believe that I met the royals", said Victoria O'Brien, still sobbing several minutes after the royal couple had moved past her.
The Invictus Games - founded by Harry and meant to honor wounded vets - came to a conclusion later on Saturday in Australia, with both Harry and Meghan speaking to the adoring crowd.
The couple are now enjoying a royal tour to Australia, New Zeland, Tonga and Fiji.
Harry and Meghan will visit a newly unveiled UK War Memorial in Wellington and later Sunday attend a 125th anniversary celebration of women's suffrage in New Zealand.
As well as Wellington, the duke and duchess will also visit Auckland and Rotorua over the next four days.
However Meghan delighted the locals by joining Harry for a romantic afternoon walk along a jetty. It's the first time that this diamond and platinum diadem has been on public display.
Two 10-year-olds who waited hours for a glimpse of Harry and Meghan as they arrived in New Zealand got more than they bargained for when the Duke and Duchess of Sussex agreed to pose for a picture.