Princess Mary has been named official regent in Denmark, which means she can now act on behalf of the queen of the country.
The princess born in Tasmania, who married the crown prince Frederick after meeting him in a pub in Sydney during the 2000 Olympic Games, will become queen when her husband ascends the throne.
But until now, only he and his younger brother, Prince Joachim, and his aunt, Princess Benedikte, could act on behalf of Queen Margrethe II.
"As regent, the Crown Princess will now be able to perform the duties of the Queen as head of state when the Queen and the Crown Prince will not be able to do so, for example during a stay abroad. ", a statement issued by the royal family said.
A photo published on Instagram showed Princess Mary, elegantly dressed in red, signing official documentation with Prince Frederick, Queen Margrethe and the Danish Prime Minister, Mette Frederiksen.
"The Crown Princess signed the declaration necessary to act in accordance with the constitution in the presence of the queen, her royal highness the crown prince and the government," said the royal family.
Queen Margrethe, 79, reigned over Denmark for 49 years after the death of her father, King Frederick IX, in 1972. It was the first female sovereign in the country.
As his firstborn son, Prince Frederick will ascend to the throne after his death or abdication. His father, Prince Henrik, died at the age of 83 after a battle with Alzheimer's in February last year.
Mary and Frederick met at the Slip Inn bar in Sydney while working as a marketing executive and living on a rented terrace in Paddington. The 28-year-old then had no idea he had just met a real, as he introduced himself as "Fred".
After three years of appointments, the couple was engaged and then married in a sumptuous ceremony in Copenhagen Cathedral on May 14, 2004.
Now they have four children together, Prince Christian, 13, Princess Isabella, 12, and twins Prince Vincent and Princess Josephine, 8 years old.
At the dinner for the fiftieth birthday of Prince Frederick last year, Mary revealed that her husband often laughed at her own jokes and was a dedicated "mamil" – representing middle-aged Lycra men.
"Mamil is synonymous with a middle-aged man in Lycra who drives expensive racing bikes wearing professional-style sweaters and shorts," he said.
"Opinions vary depending on whether Lycra and men in their 40s join. But darling, you still look pretty sharp in Lycra. "
The regal and discreet glamor has also reduced him to tears when he talks about their children's love for him.
"I'm so happy that you swept me off my feet and we dared to fall in love not just for a moment but for life," he said.