Can you spot what's different about this royal portrait? Princess Isabella of Denmark breaks protocol as she poses for her 18th birthday

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Princess Isabella has stunned in her first official gala portraits to mark her 18th birthday on Monday, but royal fans have spotted something very unusual about the photos.

The eldest daughter of Queen Mary and King Frederik X of Denmark, who enjoyed multiple events in honour of her birthday last week, posed for the photographs at Knight's Hall of Frederick VIII's Palace in Amalienborg.

Isabella wowed in a vibrant orange ball gown, which was adorned with the Order of the Elephant and a miniature portrait of her father, and a sparkling tiara.

However the princesses snaps stood out from the usual official royal portraits, as she appeared to be holding her mobile phone in one image. 

In a break with royal protocol, the teenager beamed while holding her iPhone and decked out in an opulent diamond tiara and royal regalia.

The modern snap was posted on the Danish royal family’s official website and social media channels and it caused a stir online.

One person wrote: 'I love this royal family so much, she is just like a normal teenager, got her iPhone in hand and having her parents take quick snap shots of her. Happy birthday.'

Another added: 'Cool with the meeting between the gala dress, tradition and then modern life.'

Denmark's royal household has released Princess Isabella's first official gala portraits to mark her 18th birthday on Monday- however many noticed a modern twist as the teenager held her mobile phone in one snap 

Someone else said: 'Love everything about it. The big, beautiful smile, the fantastic dress and all the jewellery - and then a typical teenager's indispensable companion: an iPhone.'

While a fourth added: 'Such a good picture, a princess and ordinary teenager with the mobile in hand, real smile and so much the eyes shine in a mega beautiful and dazzling dress.'

The caption alongside the latest image saw the Princess issuing a heartfelt 'thank you' to everyone who had 'helped me celebrate my 18th birthday'.

It was also significantly the first time a social media message on the family's account was signed off personally as 'H.K.K Prinsesse Isabella'.

The informal snap was accompanied a series of official portraits which showcased Isabella's gown and sparkling tiara, which marked the first time the teenage princess has worn a tiara.

The Danish Royal House confirmed that former monarch Queen Margrethe II gifted her granddaughter the turquoise daisy bandeau diadem as an 18th birthday gift.

A translated statement from the royal household explained: 'The tiara is a so-called 'bandeau', a headband in French, as the relatively narrow tiara is intended to be worn almost horizontally as a hair band.'

The floral headpiece is made of gold and adorned with 11 rosettes of 'daisy-like flowers' that decrease in size.

The eldest daughter of Queen Mary and King Frederik X of Denmark, who enjoyed multiple events in honour of her birthday last week, posed for the photographs at Knight's Hall of Frederick VIII's Palace in Amalienborg

Isabella wowed in a vibrant orange ball gown, which was adorned with the Order of the Elephant and a miniature portrait of her father, and a sparkling tiara

The Danish Royal House confirmed that former monarch Queen Margrethe II gifted her granddaughter the turquoise daisy bandeau diadem as an 18th birthday gift

The modern snap was posted on the Danish royal family ’s official website and social media channels and it caused a stir online

The delicate headpiece has added sentimental value because it features precious gems in a flower setting arrangement. This is significant because Queen Margrethe's nickname amongst her inner circle is 'Daisy'.

The tiara is a family heirloom, with the royal statement expanding on the history of the bejewelled piece.

'The tiara was made in the late 19th century and belonged to Crown Princess Margareta of Sweden. After her untimely death in 1920, her daughter, Princess Ingrid, received the tiara as a confirmation gift and brought it to Denmark upon her marriage to the later Frederik IX.'

A versatile and convertible headpiece like many other pieces of the Royal House's jewellery, the tiara has 'multiple functions' and can be 'disassembled and used as a bracelet'.

According to The Court Jeweller, the young royal's new tiara forms part of a turquoise parure, which refers to a set of matching jewels.

Interestingly, Isabella's mother Queen Mary is the current owner of the matching turquoise drop earrings and brooch from the parure, which were gifted to her by Queen Margrethe on her 50th birthday.

Naturally, Mary, 53, happily loaned the earrings to her eldest daughter to wear for her 18th birthday portrait photoshoot.

Mary was recently seen wearing the same earrings when she attended King Charles III's coronation in May 2023.

Princess Isabella pictured with Queen Mary of Denmark before her birthday performance last Tuesday 

Queen Mary (left) loaned her daughter Princess Isabella the matching turquoise earrings for the portrait picture. They are from the same parure as the daisy bandeau tiara, and both were gifted by Queen Margrethe. She is pictured (right) wearing them previously at a 2012 state dinner

Meanwhile, Queen Margrethe, 85, has also previously been seen wearing the turquoise daisy bandeau tiara that she's now gifted to Isabella. For instance, she wore it at a 2012 state banquet dinner she hosted in honour of the visiting Chinese President.

Margrethe has also occasionally loaned the delicate tiara out to family members, including her niece Princess Theodora of Greece and Denmark, who borrowed the headpiece to wear during the then-Queen's Ruby Jubilee celebrations.

For the new portraits, Isabella donned a regal orange satin gown created by up and coming Danish designer, Carina Grønning.

The teen princess also showcased her significant Order of the Elephant sash and regalia on top of the dress as well as a miniature portrait of King Frederik.

The picture of her monarch father is set in a gold frame encircled by 12 white pearls and 12 small diamond crosses, symbolizing the Order of Dannebrog. The portrait was painted in watercolour on a thin slice of mammoth ivory by British miniaturist Tom Mulliner.

The new portrait images of Princess Isabella were shared on the Danish royal website and social media accounts alongside the caption: '18 years ago today Her Royal Highness Princess Isabella was born'.

'The birthday itself is marked with the publication of the Princess's first official gala portraits,' it read.

'The princess is photographed in the Knight's Hall of Frederick VIII's Palace in Amalienborg, and on the portraits Her Royal Highness wears the Order of the Elephant with a star chest... and a miniature Order portrait of her father, His Majesty the King.'