The Danish royal heir, Crown Prince Frederik, married Tasmania's Mary Donaldson yesterday in a fairy-tale prince-and-commoner wedding that delighted pro-monarchy Danes and Australian republicans alike.

Danes lined the streets to cheer as their prince married a foreigner without a drop of blue blood, putting Donaldson in line to be the first Australian-born woman to become a queen.

"She is stunning, absolutely stunning. Typically Australian. I think I'm gonna cry," said Hayley from the Australian city of Perth, visiting Copenhagen with her family for the wedding.

Security was tight as royalty from Europe and Japan gathered to watch the 35-year-old prince marry his bride of 32. She joins a royal house that the Danes say is Europe's oldest, dating back to the Viking king Gorm the Old, who died in 958.

The prince, popular for his common touch, cried as his princess walked up the aisle in a gown of white duchess satin with a veil of almost 100-year-old Irish lace, once used by Mr Frederik's grandmother. Ms Donaldson's bearded father wore the kilt of his Scottish clan and Mr Frederik wore his naval uniform.

The Bishop of Copenhagen, Erik Svendsen, said in his sermon that "nothing in the real world is as uncomplicated as in the fairy tales" - and Ms Donaldson's subjects expect the former real estate agent and marketing executive to work for her keep.

"She will represent Denmark and sell us abroad, working for us just like Queen Margrethe and Prince Henrik," said Annie Jensen, soaking up the atmosphere as the self-proclaimed "world's biggest didgeridoo orchestra" played for the crowd.

The crowd roared when Donaldson, now Crown Princess Mary, kissed her new husband on the cheek as a horse-drawn carriage took them to Amalienborg palace, where they waved to the crowd from a balcony and kissed. Later on around 400 guests were due to attend the evening banquet at Fredensborg castle.

"It's easy to see they are real people and that they are truly in love. I cried when I saw Frederik crying in the church," said Danish-American Deborah Marlow.

"We love it! We love it!" screamed Danish teenagers Signe Lundgren and Kristina Villadsen, both wearing plastic tiaras. "Mary will make an excellent princess and queen," said Signe.

More than four-fifths of Danes approve of the monarchy, which is twice as popular now as when Margrethe came to the throne in 1972. Trine Petersen, sitting by the royal route drinking beer with her family, explained why the royals are so well-liked.

"They are so much like us. I've even danced with the crown prince. You see them in the street or at the pub," she said.

Across Australia, people gathered at pubs, clubs and even schools to celebrate the wedding.

In Donaldson's native Hobart, children went to school dressed as Vikings and princesses. Sydney's Danish community watched it live in the city's opera house, designed by a Dane.

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