One’s a little princess with a big personality, the other her partner in all things fun.
As the youngest children to Prince Frederik and Princess Mary, twins Princess Josephine and Prince Vincent are used to being the centre of attention.
And on Friday all eyes were once again on the adorable pair who celebrated their fifth birthday with a celebration at home.
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Royal cuteness: Princess Mary’s twins Princess Josephine and Prince Vincent turned five on Friday (two-year-old twins pictured at Grasten Castle in 2013)
Front and centre: The young Danish royals are used to being the centre of attention (pictured at seven-months on board the royal yacht)
Sticking together: They are often pictured together playing, eating ice cream or on royal duties with the family (pictured: twins, then four, eat yoghurt in April 2015 on Denmark’s Organic Day)
The twins were born to Prince Frederik and Australian-born Princess Mary in Copenhagen University Hospital on January eight, 2011.
Prince Vincent is the elder of the two having been born 26 minutes before his sister.
Their birth was marked with 21-gun salute as Prince Frederik fronted national and international press to announce their arrival.
Twice as nice: Princess Mary and Prince Frederik welcomed the twins on January 8, 2011 at Copenhagen University Hospital (pictured at 10 months old in Sydney)
Big brother duties: Prince Vincent was born 26 minutes before his sister (pictured at 13 months old in Switzerland)
Special occasion: They will celebrate their birthday with a party at home with extended family and the release of a photo
Vincent and Josephine have grown up in the public eye alongside their elder siblings Prince Christian, 10, and Princess Isabella, eight.
On April 14, 2011 the twins were photographed with their parents at the chapel of the Church of Holmen on the day of their christening.
Princess Mary wore a royal blue dress and white floral headpiece for the occasion, where the twins’ full names were announced: Josephine Sophia Ivalo Mathilda and Vincent Frederik Minik Alexander.
Christening: The twins were christened on April 14, 2011 and their full names – Josephine Sophia Ivalo Mathilda and Vincent Frederik Minik Alexander – were announced
Babies in blue: In November 2011 the twins accompanied their parents on an official visit to Australia, here they are pictured at Admiralty House at 10 months old
The young prince and princess have grown in to their personalities with Josephine often pictured pulling funny faces.
During the family’s annual Hubertus Hunting event last year the cheeky princess could be seen from the Eremitage Castle balcony pulling a series of hilarious poses, with Vincent often joining in on the fun.
In July 2015 Josephine broke her arm in a horse riding lesson and was later seen sporting a blue cast.
Horsing around: Princess Josephine, then four, was left with a blue cast after she broke her arm falling off a horse in 2015
Snow fight: Then three-year-old Vincent and Josephine played in the snow with their mother on a skiing holiday to Switzerland in 2014
Royal wheels: Princess Mary, Prince Frederik and their then three-year-old twins attend the annual summer photo call for the Royal Danish Family at Grasten Castle in 2013
The twins have taken part in royal duties over the years including cutting a ribbon for Denmark’s Organic Day in April 2015 and taking part in a tree planting on the family’s royal visit to Greenland.
Photos taken over the years show the twins share more than matching blonde hair and blue eyes.
They are often seen playing in the snow or eating ice cream together and standing side by side on family outings.
Royal duties: The twins joined their elder sister Princess Isabella to cut a ribbon at Denmark’s Organic Day in April 2015
Family portrait: The then three-year-old twins visited the Danish royal residence Chateau de Cayx for a photo shoot in June 2015
Growing up: Tradition sees a photo released each year to mark the twins birthday (pictured: three-year-old twins in Switzerland)
International Business Times reported the twins’ fifth birthday would be marked with a photo taken by an official photographer – as has been tradition.
They also reported royal watchers saying Princess Mary might take the photograph herself.
Their birthday celebration will be attended by extended family including their grandparents Queen Margrethe II and Prince Henrik and their uncle Prince Joachim, who is Frederik’s younger brother.