Meghan Markle and Prince Harry will be joined by two other royals on their first royal tour

On their first royal tour, Meghan Markle and Prince Harry may be joined by Prince Frederik of Denmark and his wife, Princess Mary.

The official website of the British Royal Family earlier announced that Prince Harry and Meghan are set to visit Australia, New Zealand, Fiji and Tonga come autumn.

As reported by Hello!, Danish royals Prince Frederik and Princess Mary will be in attendance when Harry and Meghan open the Invictus Games in Sydney, Australia towards the end of October 2018.

Sydney has a special place in Frederik and Mary’s hearts. Mary was born in Sydney and it was where she met Frederik during the 2000 Summer Olympics. The following year, Mary moved to Denmark to be with Frederik.

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Harry and Meghan, who tied the knot on May 19, 2018, will embark on their first royal tour after they were invited by the governments of Australia and New Zealand. They will visit the Commonwealth countries of Fiji and Tonga at the request of the Foreign Commonwealth Office.

The royal couple are also set to visit the US, Meghan’s native country, in the spring of 2019, as earlier reported by US Magazine.

They don't have itinerary yet for their US tour but they are likely to head to New York, Washington D.C. and California.

"They are so excited to head to the U.S. Meghan is looking forward to introducing Harry to everything she loves about the U.S.," the magazine quoted an unnamed 'palace insider' as saying.

"Meghan and Harry want to solidify ties between the U.K. and the U.S. They want to highlight and foster these relationships," US Magazine's source said.

Given Prince Harry's close ties with the Obamas, the royal couple may also drop by the Obama Foundation in Chicago.

The tour may also extend to Canada, where Meghan was temporarily based when she was working for the hit drama series, "Suits."

"The Canadian Foreign Office has heard about the tour and would love to have them stop there. This may very well become a North American tour," the insider added.

The Duke and Duchess of Sussex, who recently adopted a dog, have been attracting adoring crowds in their out-of-town trips.

Recently, they went to Ireland and was warmly welcomed by the locals.

They even received an impressive sketch of their official engagement photo from a student when they went to the Trinity College in Dublin.