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THE Duchess of Cambridge wore a white Alexander McQueen outfit to the christening of Prince Louis yesterday.

But this isn't the first time Kate Middleton has worn white to for her children's christenings.

 Kate wore Alexander McQueen yesterday for Prince Louis' Christening
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Kate wore Alexander McQueen yesterday for Prince Louis' ChristeningCredit: AFP

At Prince George's in 2013 she wore a similarly-coloured Sarah Burton dress.

Then, in 2015 at Princess Charlotte's, she also wore another frock by Burton in a cream shade.

And while there is no Royal rule which dictates what Kate can or cannot wear, she's made it her own tradition to always wear white or cream.

And Royal observers think it is because her outfits perfectly match the Royal Christening Gown, worn by all three of her children.

 Proud mum Kate cuddles Princess Charlotte on her christening day
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Proud mum Kate cuddles Princess Charlotte on her christening dayCredit: Getty - Pool
 She wore cream Sarah Burton for Prince George's christening
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She wore cream Sarah Burton for Prince George's christeningCredit: PA:Press Association

The gown has a short history as it is a replica of the Royal Christening Gown and was made in 2008 by Angela Kelly.

The original was made in 1841 and commissioned by Queen Victoria for her firstborn, Princess Victoria.

It was styled after her own wedding dress, and was made of Spitalfields lace with a Honiton lace overlay.

In her diary Queen Victoria described it as: "A white Honiton point lace robe and mantle over white satin."

She added her daughter looked “very dear” in it.

 Kate and William chatted to The Archbishop of Canterbury at yesterday's service
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Kate and William chatted to The Archbishop of Canterbury at yesterday's serviceCredit: Reuters

But there could be another reason Kate favours white or cream - because the shade is also representative of purity, innocence and new beginnings.

Meanwhile, it was also spotted that Kate sported floral pearl earrings at Louis' Christening.

Louis' grandmother, Princess Diana's, favourite flower was the white rose - so the earrings could be a nod to her and the grandchildren she never got to meet.

Meghan Markle made a loving gesture to Prince Harry at Louis' Christening - did you see it?

Who is Hannah Carter? We've got the lowdown on Prince Louis' Godmother here.

Princess Charlotte cheekily reminds the press that they're not invited to her brother Prince Louis' christening party