Royal Tour: Day 1 of the Australian Tour

When the couple returned to Admiralty House for a Governor-General reception on Tuesday afternoon, the Duchess had changed into a green dress by US designer Brandon Maxwell, and a pair of Dior heels. She had also styled her hair - which was loose around her shoulders earlier in the day - into her signature tousled updo.She left on Princess Diana's gold bangle and butterfly earrings

Day one of the pregnant Duchess of Sussex's royal tour has been a sartorial smash hit. Meghan flawlessly pulled off what's bound to be the first of many costume changes in Sydney on Tuesday, at the start of the couple's 16-day tour of Australia, New Zealand, Fiji and Tonga.

In a nod to her host nation, Meghan, 37, chose a white shift dress by the Australian designer Karen Gee to visit Taronga Zoo, Sydney Harbour and the Opera House today, teamed with a chic trench coat by another Australian label, Martin Grant, and Stuart Weitzman heels.

The website briefly crashed following the Duchess' appearance as fans rushed to search for the frock, which is called the 'Blessed' dress - possibly a sweet reference to the happy news that Meghan and Harry are expecting their first baby, which was confirmed by Kensington Palace on Monday shortly after their arrival in Australia.

Meghan later swapped the dress for an AUD$2,555 (£1,385) dark green number by the US designer Brandon Maxwell and a pair of Dior stilettos as she returned to Admiralty House for a reception hosted by the Governor-General, where her husband delivered a speech to guests.

In a touching tribute to her late mother-in-law, Meghan wore jewellery belonging to Princess Diana throughout the day; a pair of delicate butterfly earrings, and a gold bangle. Read more from The Daily Mail.