Princess Isabella celebrates her 18th birthday with her parents (2025)

Princess Isabella of Denmark has stunned the world overnight during her arrival at the second of two 18th birthday celebrations held in her honour — more than a week before her actual birthday on April 21.

King Frederik X and Queen Mary's eldest daughter was the picture of poise and elegance as she arrived at The Royal Danish Theatre's Old Stage in Copenhagen on Monday evening.

A special gala performance was held in her honour, with Denmark's entireroyal family in attendance.

Easter Monday official festivities were brought forward to avoid clashing with the public holiday.

Isabella looked breathtaking in a deep navy ball gown that shimmered under the lights.

She completed the look with a navy clutch, a soft updo, and a pair of sparkling diamond earrings borrowed from her mother, Queen Mary.

It was expected that the princess would wear the Order of the Elephant insignia for the first time.

But instead, she kept it simple and sentimental - opting for heirloom jewellery over royal regalia.

Standing proudly beside her were her parents, King Frederik and Queen Mary.

The royal couple were joined by their other children — Prince Christian, 19, and 14-year-old twins Prince Vincent and Princess Josephine.

Queen Mary looked radiant in a black satin off-the-shoulder top, paired with a glittering silver-sequinned skirt.

She completed her look with a diamond brooch and a ruby necklace.

King Frederik looked sharp in a classic navy tuxedo with black lapels and a crisp white pocket square.

The gala was a full family affair.

Former monarch Queen Margrethe was also in attendance. The beloved royal abdicated just over a year ago, handing the throne to her son, King Frederik.

Princess Isabella's cousins Count Nikolai and Count Felix of Monpezat were also there.

The pair had their HRH and princely titles stripped in early 2023, sparking public debate.

Count Nikolai has been living in Australia since 2023 while attending university in Sydney.

He is believed to have flown into Denmark just hours before the gala to celebrate with Isabella.

Crowds of well-wishers gathered outside the theatre, waving Danish flags and cheering for the royal family.

Isabella smiled and waved as she greeted them, soaking in the special moment.

The event marked a major milestone for the young royal.

Now officially second in line to the throne behind her brother Prince Christian, Isabella is stepping into her role as a senior royal.

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