Britain's Prince Harry, the Duke of Sussex, and his wife Meghan, the Duchess of Sussex, meet an echidna held by Dr Michelle Shaw, left, during a visit to Taronga Zoo in Sydney, Australia, Tuesday, Oct. 16, 2018. Prince Harry and his wife Meghan are on a 16-day tour of Australia and the South Pacific. (Dean Lewins/Pool via AP)

The Duke and Duchess of Sussex thrilled thousands of fans outside the Sydney Opera House on Tuesday during their first meeting with the general public since the Meghan's newly announced pregnancy.

The Royal couple arrived in Sydney on Monday to kick-off their 16-day tour of Australia, Fiji, Tonga and New Zealand.

And while Meghan is thought to be about 12-weeks pregnant, she and Prince Harry have made the most of the first day of their tour.

Meeting members of the public outside Sydney Opera House.

Treated to a private dance showcase.

Visiting Taronga Zoo and having baby koalas named after them.

Receiving authentic Australian headwear from Governor-General Sir Peter Cosgrove and Lady Cosgrove.

Meanwhile, Meghan and Harry have taken on doctor's advice on how Meghan can best avoid outside areas where there is a risk of contracting the Zika virus on their trips to Fuji and Tonga.

The couple is taking precautions by only Harry visiting Fiji's Solo-i-Suva forest for the unveiling of the Queen's Commonwealth Canopy and the same for their planned trip to Suva's War Memorial, The Sun reports.

The pair will spend a total of three days in Fiji, and a day in Tonga.