The royal family has to adhere to specific guidelines when it comes to fashion. The protocol requires them to dress in such a style that is both chic and modest.

As we all know, the Duchess is a style icon, but the thing about turning to the same designers, again and again, is every so often, it results in outfits popping up twice.

Take a look at the adorable photos of the little Prince's and Princess twinning with their parents, as well as the adorable new birthday pictures of Louis!

The British Royal Family are one of most famous families in the world.

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Yes, even more famous than our beloved Kardashians.

But, out of the many members of the British family...

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The Duke and Duchess of Cambridge, or William and Kate, as we know them best, are the firm favorites of the younger, more modern monarchy.

They have long been royal favorites.

Following their lavish, and highly documented royal wedding in 2011, Wills and Kate were thrown into the media spotlight, and we still can't get enough of them.

Though their relationship was on and off for years...

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They clearly couldn't stay away from each other, and their engagement was announced in 2010, 9 years after they first met.

And, ever since, we have followed them as their own little family grew.

In July 2013, Prince George Alexander Louis of Cambridge was born, becoming the third in line to the throne of Great Britain. Kate emerged from St. Mary's hospital in London in a blue polka dot dress, which many saw as a fitting tribute to Princess Diana, who wore a similar spotty attire herself some thirty-one years earlier.

Princess Charlotte followed shortly after.

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Princess Charlotte Elizabeth Diana was born in May 2015, just under 2 years after her older brother.

The princess has actually made royal history.

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Princess Charlotte became the first female royal to retain her claim to the throne, despite having a younger brother. Before the Succession to the Crown Act 2013, the birth of a son meant that he would leap over any older daughters in the line of succession.

Traditionally, Prince Louis would have overtaken Charlotte in the line to the throne.

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But, now that Princess Charlotte hasn't been ruled out by gender, Prince Louis remains fifth-in-line to the throne, while Charlotte is fourth-in-line behind her older brother, Prince George.

So, as you can see...

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William and Kate really are paving the path to a more modern monarchy.

And that fashion gene seems to have been passed down to their children...

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As the adorable princes and princess clearly get their style from their parents. In fact, they look identical...

The photos are too cute for words...

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I mean, Prince George and Prince William could literally be the same person!

And that's not the only time he's taken style advice from his dad...

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They've even had a family twinning session...

But that isn't all...

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Yesterday, the Duke and Duchess of Cambridge shared new photos of their youngest Take a look at how similar prince Louis is to his dad...

The pictures were released a day ahead of Prince Louis' birthday.

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In the Instagram pictures, Louis can be seen wearing a blue checkered button-down shirt, and we're sure we've seen that somewhere before...

During a trip to Australia in 2014, when Prince George was a baby, Prince William coincidently rocked a similar outfit.

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Prince George was photographed wearing an almost identical outfit to his younger brother, while at the Sydney Taronga Zoo.

This outfit combo is clearly a staple in the royal's wardrobe, but no matter how often they wear it, it's still just as cute to see the father-son duo pull off the same attire.

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Kensington Palace's Instagram caption read: "Sharing a sneak peek of Prince Louis’s handiwork ahead of his second birthday! 🎨," Take a look at the adorable pic below...