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Crown Princess Mary of Denmark has shared a tender moment with her four adorable children as they joined Queen Margrethe to celebrate her 79th birthday.

The royal family stood by the Danish monarch as she belted out a song from the porch of the Marselisborg Palace in front of the awaiting crowd that had gathered for the special occasion at midday on Tuesday.

Princess Mary was openly affectionate with her kids - Prince Christian, 13, Princess Isabella, 11, and eight-year-old twins Prince Vincent and Princess Josephine, flanked by their father Crown Prince Frederik.

Her sartorial elegance has certainly been passed down to her two young daughters who donned pleated skirts, knitted sweaters over their white collared tops and finished off their looks with stylish check wool coats.  

As the beaming family waved at the cheering crowd from the balcony in Aarhus, Denmark, the doting mother looked every inch of the stylish royal as she was surrounded by her adoring children who were right by her side.

Crown Princess Mary of Denmark has shared a tender moment with her daughters Princess Isabella and Princess Josephine

The doting mother was openly affectionate with her kids, including Prince Christian, 13, and eight-year-old Prince Vincent

The family all dressed smartly for the occasion, with the Danish Queen sporting a smart grey skirt suit, a bright blue blouse and a brown wool coat

During the balcony appearance, the Danish Queen received a small bouquet of flowers from Princess Isabella which featured a patriotic Danish flag.

The family all dressed smartly for the occasion, with Princess Mary opting for a chic green dress with white patterns, which she teamed with a complimentary green coat and a vibrant splash of red nail polish. 

The Australian-born princess wore her brunette tresses loose and naturally wavy, while her mother-in-law swept her locks into a chic updo.

Queen Margrethe celebrated without her husband of 50 years, Prince Henrik, by her side, after he tragically died last year.

But she was in good spirits - and her obvious enthusiasm and passion towards her chant proved infectious, with Princess Josephine emulating her grandmother's raised arm as she sang along. 

Like mother, like daughters: Princess Mary's sartorial elegance has certainly been passed down to her two girls who both wore stylish pleated skirts, knitted sweaters over their collared white tops, and finishing off their looks with stylish coats

 Princess Mary was pictured sharing a sweet moment with her children as they celebrated the Danish Queen's birthday

Princess Isabella and Princess Josephine huddled around their mother as they all shared a laugh together

The doting mother was pictured being affectionate with her children as she helped Isabella (left) take the hair out of her face at one stage - and holding Prince Vincent (right) close to her during the birthday celebration

Getting into the spirit! Princess Josephine emulated her grandmother's raised arm as she sang along with her dad Crown Prince Frederik, while her sister Princess Isabella looked a little less convinced

It was smart wool blazers all round for the boys, with Prince Frederik's sons Prince Christian and Prince Vincent following their father's lead.

Hundreds gathered to pass on their well-wishes, but one noticeable absentee from the celebrations was the queen's youngest son, Prince Joachim, his wife Princess Marie and his four children. 

Queen Margrethe has been on the throne since January 1972, when she succeeded the late King Frederick IX at the age of 31.

Earlier this month she and Princess Mary visited a Copenhagen zoo for the opening of a new enclosure that will house two pandas.

During the balcony appearance Queen Margrethe received a small bouquet of flowers from Princess Isabella, 11, which featured a patriotic Danish flag

Goofing around! Prince Christian playing with his little brother Prince Vincent as they waved to the cheering crowd

True love! Princess Mary was pictured holding hands with her husband Crown Prince Frederik as she waved at the crowd