SYDNEY, AUSTRALIA - OCTOBER 16: Prince Harry, Duke of Sussex and Meghan, Duchess of Sussex board a boat from Taronga Zoo and head to the Man O'War Steps on October 16, 2018 in Sydney, Australia. Chris Jackson/Pool via REUTERS

Britain's Prince Harry and Meghan, Duchess of Sussex react during a ceremony at Taronga Zoo in Sydney, Australia, Tuesday, Oct. 16, 2018. Kirsty Wigglesworth/Pool via REUTERS

Meghan, Duchess of Sussex and Prince Harry, Duke of Sussex react during a visit at the Sydney Opera House in Sydney, Australia, October 16, 2018. Paul Edwards/Pool via REUTERS

Britain's Prince Harry and wife Meghan, Duchess of Sussex pose with Australia's Governor General Peter Cosgrove and wife Lynne Cosgrove at Admiralty House during their visit in Sydney, Australia October 16, 2018.

Crowds wait for the arrival of Britain's Prince Harry and Meghan, Duchess of Sussex, at the Sydney Opera House in central Sydney, Australia, October 16, 2018.

Meghan, Duchess of Sussex and Prince Harry, Duke of Sussex meet Dafney Dunne during a visit at the Sydney Opera House in Sydney, Australia, October 16, 2018. Paul Edwards/Pool via REUTERS

Britain's Prince Harry and wife Meghan, Duchess of Sussex walk during a visit at the Sydney Opera House in Sydney, Australia October 16, 2018.

SYDNEY, AUSTRALIA - OCTOBER 16: Prince Harry, Duke of Sussex and Meghan, Duchess of Sussex ride in a boat from Taronga Zoo to the Man O'War Steps on October 16, 2018 in Sydney, Australia. Chris Jackson/Pool via REUTERS

Britain's Prince Harry and wife Meghan, Duchess of Sussex look at bush hats with Australia's Governor General Peter Cosgrove and his wife Lynne Cosgrove at Admiralty House during their visit in Sydney, Australia October 16, 2018.

Britain's Prince Harry and wife Meghan, Duchess of Sussex are welcomed by Australia's Governor General Peter Cosgrove and his wife Lynne Cosgrove at Admiralty House during their visit in Sydney, Australia October 16, 2018.

Britain's Prince Harry and wife Meghan, Duchess of Sussex speak with members of the public during a visit at the Sydney Opera House in Sydney, Australia October 16, 2018.

Meghan, Duchess of Sussex and Prince Harry, Duke of Sussex attend a rehearsal by the Bangarra Dance Company inside the Sydney Opera House, Australia October 16, 2018. Ian Vogler/Pool via REUTERS

People hold posters of Britain's Prince Harry and wife Meghan, Duchess of Sussex in Sydney, Australia October 16, 2018.

Britain's Prince Harry and wife Meghan, Duchess of Sussex meet participants of the Invictus Games with Australia's Governor General Peter Cosgrove and wife Lynne Cosgrove at Admiralty House during their visit in Sydney, Australia October 16, 2018.