LONDON, UNITED KINGDOM – SEPTEMBER 28: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 24 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge attends the “No Time To Die” World Premiere at the Royal Albert Hall on September 28, 2021 in London, England. (Photo by Max Mumby/Indigo/Getty Images)

Celebrating her birthday on Sunday, January 9th, Kate Middleton will be turning 40-years-old. A landmark celebration, it is expected for the Duchess of Cambridge and mother of three to be keep the festivities low-key with the focus remaining on her family. With the milestone forthcoming, GRAZIA makes note of the most iconic milestone moments in Kate Middleton’s fashion history.

Known for her exquisitely curated royal wardrobe, Middleton has often paid homage to her late mother-in-law’s inimitable legacy through sartorial expression. Her Issa London blue silk-jersey ‘Sapphire London’ wrap dress she donned to officially announce her engagement to Prince William mirrored that of the blue suit set adorned by Princess Diana for the very same occasion. Opting for polka-dots to present Prince George to the public, the Jenny Packham look echoed that of the green polka-dot ensemble worn by Diana to present Prince William as a newborn.

Always pristinely tailored, the Duchess has a tendency to call upon her favorite designers time and time again. One to repeatedly opt for Jenny Packham or Alexander McQueen, Middleton also repeats her favorite wardrobe staples- a concept typically foreign to A-listers of this magnitude. Preppy and timeless, the royal family member’s signature style is certainly fit for a queen.

In celebration for the Duchess’ 40th birthday, here are Kate Middleton’s top ten style moments, bound to go down in royal family history.

Kate Middleton in Issa London at her engagement announcement in 2010

LONDON, ENGLAND – NOVEMBER 16: Prince William and Kate Middleton pose for photographs in the State Apartments of St James Palace on November 16, 2010 in London, England to announce their engagement. (Photo by Chris Jackson/Getty Images)

Kate Middleton wears an Alexander McQueen wedding gown in 2011

LONDON, ENGLAND – APRIL 29: Their Royal Highnesses Prince William Duke of Cambridge and Catherine Duchess of Cambridge exit Westminster Abbey after their Royal Wedding on April 29, 2011 in London, England. (Photo by Ian Gavan/GP/Getty Images)

Kate Middleton wears Jenny Packham to the London Olympics Gala in 2012

Britain’s Prince William and his wife Catherine, Duchess of Cambridge, arrive for a British Olympic Team GB gala event at the Royal Albert Hall in London, on May 11, 2012. AFP PHOTO / POOL / ALASTAIR GRANT (Photo credit should read ALASTAIR GRANT/AFP via Getty Images)

Kate Middleton wears Jenny Packham after the birth of Prince George in 2013

LONDON, ENGLAND – JULY 23: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge depart The Lindo Wing with their newborn son at St Mary’s Hospital on July 23, 2013 in London, England. (Photo by Ferdaus Shamim/WireImage)

Kate Middleton wears Jenny Packham after the birth of Princess Charlotte in 2015

LONDON, ENGLAND – MAY 02: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge leave The Lindo Wing of St Mary’s Hospital with their newborn daughter, Princess Charlotte of Cambridge, on May 2, 2015 in London, England. (Photo by Ian Gavan/Getty Images)

Kate Middleton wears Alexander McQueen to Pippa Middleton’s wedding in 2017

ENGLEFIELD GREEN, UNITED KINGDOM – MAY 20: Catherine, Duchess of Cambridge and Princess Charlotte of Cambridge attend the wedding of Pippa Middleton and James Matthews at St Mark’s Church on May 20, 2017 in Englefield Green, England. (Photo by Max Mumby/Indigo/Getty Images)

Kate Middleton wears Jenny Packham after the birth of Prince Louis in 2018

LONDON, ENGLAND – APRIL 23: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge depart the Lindo Wing with their newborn son Prince Louis of Cambridge at St Mary’s Hospital on April 23, 2018 in London, England. (Photo by Karwai Tang/WireImage)

Kate Middleton wears Alexander McQueen to Meghan Markle and Prince Harry’s wedding in 2018

Princess Charlotte of Cambridge (L) and Catherine, Duchess of Cambridge, (R) after attending the wedding ceremony of Britain’s Prince Harry, Duke of Sussex and Meghan Markle at St George’s Chapel, Windsor Castle, in Windsor, on May 19, 2018. (Photo by Andrew Matthews / POOL / AFP) (Photo credit ANDREW MATTHEWS/AFP via Getty Images)

Kate Middleton wears Alexander McQueen to a Dutch State Dinner in 2018

Britain’s Catherine, Duchess of Cambridge, (L) walks with Rear Admiral Ludger Brummelaar (R) as they attend a State Banquet in honour of King Willem-Alexander and Queen Maxima of the Netherlands at Buckingham Palace in London on October 23, 2018, on the first day of the Dutch King and Queen’s two-day state visit. (Photo by John Stillwell / POOL / AFP) (Photo credit should read JOHN STILLWELL/AFP via Getty Images)

Kate Middleton wears Jenny Packham to the No Time To Die premiere in 2021

LONDON, ENGLAND – SEPTEMBER 28: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend the “No Time To Die” World Premiere at Royal Albert Hall on September 28, 2021 in London, England. (Photo by Karwai Tang/WireImage)
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