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Matt Holyoak/Camera Press/REDUX

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02of 13Matt Holyoak/Camera Press/REDUXPrince George letsPrincess CharlotteandPrince Louistake center stage in their first official portrait as a family of five.

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Prince George letsPrincess CharlotteandPrince Louistake center stage in their first official portrait as a family of five.

03of 13Samir Hussein/Samir Hussein/WireImagePrince George,Princess Charlotteand momKate Middletonplayed on the sidelinesof dadPrince William’s, charity polo match in June. George looked on as Charlotte showed off her tumbling skills.

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Samir Hussein/Samir Hussein/WireImage

Maserati Royal Charity Polo Trophy

Prince George,Princess Charlotteand momKate Middletonplayed on the sidelinesof dadPrince William’s, charity polo match in June. George looked on as Charlotte showed off her tumbling skills.

04of 13SplashNews.comPrince Georgeleads the chase in the grass.

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SplashNews.com

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Prince Georgeleads the chase in the grass.

05of 13Samir Hussein/WireImageIn a typical big brother move,Prince Georgeruns ahead and lets Charlotte chase after him.

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Samir Hussein/WireImage

Maserati Royal Charity Polo Trophy

In a typical big brother move,Prince Georgeruns ahead and lets Charlotte chase after him.

06of 13Prince George smiles subtly when walking up to the Lindo Wing of St. Mary’s hospitalto meet his little brother, Prince Louis, for the first timein April 2018.

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Catherine Duchess of Cambridge gives birth to her third child, Lindo Wing, St Mary’s Hospital, London, UK - 23 Apr 2018

Prince George smiles subtly when walking up to the Lindo Wing of St. Mary’s hospitalto meet his little brother, Prince Louis, for the first timein April 2018.

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Chris Jackson/Getty

The Duke And Duchess Of Cambridge Visit Germany - Day 3

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Samir Hussein/WireImage/Getty Images

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09of 13George, a page boy, helps Charlotte, a bridesmaid, with her flower wreath at theMay 2017 weddingof their aunt,Pippa Middleton.

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Wedding Of Pippa Middleton And James Matthews

George, a page boy, helps Charlotte, a bridesmaid, with her flower wreath at theMay 2017 weddingof their aunt,Pippa Middleton.

10of 13George entertains a 16-month-old Charlotte with a bubble machine duringa children’s party on their Canada tourin September 2016.

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The Duke and Duchess of Cambridge visit Canada - 29 Sep 2016

George entertains a 16-month-old Charlotte with a bubble machine duringa children’s party on their Canada tourin September 2016.

11of 13Matt Dunham - WPA Pool /Getty ImagesAn almost 2-year-old George peeks into the pram atPrincess Charlotte’s christeningin July 2015.

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Matt Dunham - WPA Pool /Getty Images

The Christening Of Princess Charlotte Of Cambridge

An almost 2-year-old George peeks into the pram atPrincess Charlotte’s christeningin July 2015.

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Prince George and Princess Charlotte.Prince George and Princess Charlotte

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Prince George & Princess Charlotte Of Cambridge - Official Photographs Released

source: people.com