See photos of Middleton through the years, ahead.

The Duchess Of Cambridge Attends Action On Addiction Dinner

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Kate Middleton on Royal Skiing Holiday In Klosters

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Kate Middleton at Wedding of Laura Parker-Bowles

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Kate Middleton at Passing-Out Parade

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Lady Rose Windsor Wedding - London

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Day-Glo Midnight Roller Disco - London

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Royals Attend Nicholas Van Cutsem And Alice Hadden-Paton’s Wedding

Prince William and Kate Middleton Attend Harry Meade And Rosie Bradford’s Wedding

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Clarence House Announce The Engagement Of Prince William To Kate Middleton

Royal Wedding - Carriage Procession To Buckingham Palace And Departures

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Royal Wedding - Carriage Procession To Buckingham Palace And Departures

US President Barack Obama Visits The UK - Day One

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The Duke And Duchess Of Cambridge Canadian Tour - Day 5

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The Duke and Duchess of Cambridge Attend BAFTA Brits To Watch Event

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Duke and Duchess of Cambridge Leave For Canada

The Duke And Duchess Of Cambridge Visit People Affected By The Rioting In Birmingham

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An Alternative View Of The British Royal’s Jubilee Year

Our Greatest Team Rises - BOA Olympic Concert

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Queen Elizabeth II and The Duke And Duchess Of Cambridge Visit The East Midlands

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Olympics Day 6 - Cycling - Track

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The Duke And Duchess Of Cambridge Diamond Jubilee Tour - Day 2

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The Duke And Duchess Of Cambridge And Prince Harry Attend The Inauguration Of Warner Bros. Studios Leavesden

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The Duke And Duchess Of Cambridge Leave The Lindo Wing With Their Newborn Son

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HRH Prince George Of Cambridge Is Christened At St James' Palace

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The Royal Film Performance Of “Mandela: Long Walk To Freedom” - Red Carpet Arrivals

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Prince George Of Cambridge First Birthday

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Duke & Duchess Of Cambridge And Prince Harry Attend Grand Place

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The Duke And Duchess Of Cambridge Depart The Lindo Wing With Thier Second Child

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Celebrities At Wimbledon 2015

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Royal Film Performance: “Spectre”

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The Duke And Duchess Of Cambridge Attend The ICAP Charity Day

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The Duke and Duchess of Cambridge Enjoy Skiing Holiday

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Somme Centenary Commemorations In France

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2016 Royal Tour To Canada Of The Duke And Duchess Of Cambridge - Victoria, British Columbia

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The Duchess Of Cambridge Visits The Netherlands

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Members Of The Royal Family Attend St Mary Magdalene Church In Sandringham

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