Prince Louis charmed the world once again with the now traditional birthday photos of the Cambridge children, taken every year by their mother, keen photographer the Duchess of Cambridge.

Born in 2018, and the youngest of the Cambridge children, little Louis turned four on Saturday April 23. To celebrate the family Instagram account shared some gorgeous snaps of the tot racing across the beach in Norfolk.

With a classic yet casual look the family are known for, he wore green shorts and a grey knitted jumper with colourful star detail, and check shirt collar poking out.

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The starry jumper is from Olivier London and was actually from their 2018 collection, back when big brother George would have been four. While Prince George wasn't publicly pictured in the jumper, the brand attest the jumper was originally intended for the elder royal before being passed onto his younger brother.

A spokesperson for Olivier said in a press release: “It is a testament to our quality as this was a 2018 design. Our pieces are made to be worn time after time shared amongst brothers, sisters, cousins and friends as parents opt for ever more sustainable clothing options for their young ones.”

As the clothing worn by the Royal children sells out almost as fast as the looks worn by their mother, it's understandable the brand has announced they'll be reissuing the style in the Autumn.

But if you can't wait till then, we've rounded up some other classic British style knitwear and sweatshirts for your little princes to get that wholesome look.

Trotters Cashmere Blend Jumper, Blue
Trotters Cashmere Blend Jumper, Blue

2-11 years

Chiqui Star Knit Jumper
Mango Chiqui Star Knit Jumper
Credit: John Lewis

2-12 years

Trotters Cashmere Blend Jumper
Trotters Cashmere Blend Jumper
Credit: John Lewis

2-11 years

Dale Colourblock overhead sweatshirt
Joules Dale Colourblock overhead sweatshirt
Credit: Joules

1-12 years

And for the little princesses, these blue dresses are spot on for Princess Charlotte's Easter style.

Girls' Blue Ditsy Print Smocked Dress
Girls' Blue Ditsy Print Smocked Dress
Credit: Jojo Maman Bebe
Girls' Swan Party Dress
Girls' Swan Party Dress
Credit: Jojo Maman Bebe
Trotters Lily Rose Kids' Betsy Liberty Print Dress, Blue
Trotters Lily Rose Kids' Betsy Liberty Print Dress, Blue
Credit: John Lewis
Blue Floral Puff Sleeved Smocked Dress
Blue Floral Puff Sleeved Smocked Dress
Now 35% Off
Credit: Boden
the british royal family attend easter service
WPA Pool//Getty Images

The Cambridge family attended a traditional service on Easter Sunday (17 April) at St George's Chapel in Westminster, and were pictured wearing co-ordinating outfits. Prince William and Prince George wore matching navy suits while Kate and Princess Charlotte both attended in light blue dresses.