Princess Kate and Prince William 'struggle to find time' to meet European royals

For instance, the future King of Denmark posed with those who would inherit the throne in Belgium, The Netherlands, Norway, and Sweden.

However, Prince William and Prince George - two of the United Kingdom's future monarchs - were not present at the gala.

WATCH NOW: Kate and William regularly carry out engagements at home

The European royals all attended British events like the Coronation and the State Funeral of Queen Elizabeth II.

However, the Prince and Princess of Wales did not attend Prince Christian's birthday celebrations which attracted some criticism.

According to a royal commentator, attending the celebrations would have "given the wrong impression" and the couple did the right thing by staying in the UK.

Jennie Bond said: "Most people have had experiences of trying to get a big family reunion off the ground.

"We are all so busy that it can seem impossible.

"So I don’t see anything strange in our Royal Family struggling to find time to meet up with their European cousins."

Bond also told OK! about the negative optics of attending a royal ball during a cost-of-living crisis.

She added: "I’m not sure it would give the right impression to have a bunch of royals jetting off to Europe to join in lavish celebrations for someone’s birthday.

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"We are still in the middle of a cost of living crisis and I think our royals do much better to spend their time on the campaigns that mean so much to them at home.

"I would much rather see William and Kate in their casual working clothes, visiting a charity or talking about mental health rather than dressed up to the nines at a ball somewhere in Europe."

The British Royal Family is closely related to many of the monarchies in Europe, due to Queen Victoria's nine children marrying princes and princesses from across the continent.