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Princess Isabella of Denmark celebrates milestone birthday

The Princess turns 18 on April 21.
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Easter will be that much sweeter in Denmark this year, thanks to Princess Isabella reaching a milestone birthday. The first-born daughter of King Frederik and Queen Mary turns 18 on April 21.

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Marking the first of two dedicated celebrations, the young royal greeted fans outside the Aarhus City Hall in Denmark alongside her younger siblings, 14-year-old twins Prince Vincent and Princess Josephine, before joining her family and guests inside.

AARHUS, DENMARK - APRIL 11: Princess Isabella of Denmark arrives at Aarhus City Hall to mark Princess Isabella's 18th birthday on April 11, 2025 in Aarhus, Denmark.  (Photo by Martin Sylvest Andersen/Getty Images)
(Credit: Getty)

Delivering her first official public speech at the celebration, Princess Isabella reportedly told the crowd, “The fact you have chosen to celebrate me, and that so many people have come together, makes me happy and touched. You should know that it means a lot to me.”

The Princess will follow her initial birthday celebrations with a larger gathering on April 15.

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AARHUS, DENMARK - APRIL 11: Princess Isabella of Denmark on stage thanking all for a great day at Aarhus City Hall to celebrate her 18th birthday on April 11, 2025 in Aarhus, Denmark.
(Credit: Getty)

Where does Princess Isabella of Denmark sit in the line of succession?

Her arrival in 2007 became a history-making event, with Isabella being the first female born into the Danish royal family who wasn’t in danger of losing her place
in the line of succession to any younger brothers.

She currently sits in the second position, sandwiched between Crown Prince Christian, 19, and 14-year-old Prince Vincent.

Despite their aristocratic lineage, the trio, along with Princess Josephine, 14, have had a pretty ordinary upbringing thanks to their Australian mum.

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“They haven’t been just raised by nannies,” Danish royal commentator Trine Villemann tells WHO. “Because of Mary’s experiences growing up, it has always been 
a priority for the family to sit down to dinner a few times a week together. They are a tight little unit.”

AARHUS, DENMARK - APRIL 11: (L-R) Princess Isabella of Denmark and Queen Mary of Denmark in front of Aarhus City Hall to celebrate Princess Isabella Of Denmark's 18th birthday on April 11, 2025 in Aarhus, Denmark. (Photo by Martin Sylvest Andersen/Getty Images)
(Credit: Getty)

And Isabella is proving to be a chip off the old block. Not only is she the spitting image of Mary, 53, but the pair have similar taste in clothes, too. The princess is often dipping her hand into her mother’s wardrobe and seen wearing her clothes.

“It always brings a smile to my face,” Mary has said of the habit.

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The princess is due to graduate high school in June. In line with other royal children, it is widely expected that Isabella will take some time out to travel before heading to university.

She will also likely complete several months of compulsory military service, as Denmark brings in conscription for women from 2026. Luckily, Isabella seems to be looking forward to the training, happily posing with items from Christian’s kit while visiting him at his barracks in March.

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