Kate Middleton dazzles in blue Elie Saab at the Royal Ascot

Beautiful in blue! 

The Duchess of Cambridge joined Prince William, Prince Charles and the Duchess of Cornwall to kick off one of the biggest royal events of the year: the Royal Ascot! The annual five-day horse racing competition takes place every June, bringing together 300,000 guests near Windsor Castle dressed in their finest clothes, biggest hats and prettiest dresses. 

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Kate Middleton stuns at the Royal Ascot
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Kate Middleton stuns at the Royal Ascot
The Duchess of Cambridge during day one of Royal Ascot at Ascot Racecourse.
Britain's Kate, Duchess of Cambridge and Camilla, Duchess of Cornwall look out from a carriage in Windsor Great Park on her way to Royal Ascot horse race meeting in Ascot, England, Tuesday, June 18, 2019. (Steve Parsons/PA via AP)
The Duchess of Cambridge (left) and the Duchess of Cornwall during day one of Royal Ascot at Ascot Racecourse.
The Duchess of Cambridge attending day one of Royal Ascot at Ascot Racecourse.
The Duchess of Cambridge (left) and the Duchess of Cornwall during day one of Royal Ascot at Ascot Racecourse.
The Duchess of Cambridge (left) and Duchess of Cornwall during day one of Royal Ascot at Ascot Racecourse.
The Duchess of Cambridge (left) speaks to Zara Tindall whilst attending day one of Royal Ascot at Ascot Racecourse.
The Duchess of Cambridge (left) and the Duchess of Cornwall during day one of Royal Ascot at Ascot Racecourse.
Britain's Kate, Duchess of Cambridge looks out from a carriage in Windsor Great Park on her way to Royal Ascot horse race meeting in Ascot, England, Tuesday, June 18, 2019. (Steve Parsons/PA via AP)
ASCOT, ENGLAND - JUNE 18: Catherine, Duchess of Cambridge and Camilla, Duchess of Cornwall on day one of Royal Ascot at Ascot Racecourse on June 18, 2019 in Ascot, England. (Photo by Mark Cuthbert/UK Press via Getty Images)
The Duchess of Cambridge, the Duchess of Cornwall and the Duke of Cambridge (left to right) during day one of Royal Ascot at Ascot Racecourse.
CORRECTING TITLE FROM PRINCESS TO DUCHESS OF CAMBRIDGE- Britain's Prince William, center, and Kate, Duchess of Cambridge, arrive on the day one of the annual Royal Ascot horse race meeting in Ascot, England, Tuesday, June 18, 2019. (AP Photo/Alastair Grant)
From left, Prince William, Kate, Duchess of Cambridge, Britain's Prince Charles Camilla, Duchess of Cornwall arrive on the day one of the annual Royal Ascot horse race meeting in Ascot, England, Tuesday, June 18, 2019. (AP Photo/Alastair Grant)
Kate, Duchess of Cambridge, right, and Prince William talk with Netherlands' Queen Maxima, second from left, and Netherland's King Willem-Alexander as they arrive on the day one of the annual Royal Ascot horse race meeting in Ascot, England, Tuesday, June 18, 2019. (AP Photo/Alastair Grant)
CORRECTING TITLE FROM PRINCESS TO DUCHESS OF CAMBRIDGE- From left, Britain's Prince William, Kate, Duchess of Cambridge, and Britain's Prince Charles arrive on the day one of the annual Royal Ascot horse race meeting in Ascot, England, Tuesday, June 18, 2019. (AP Photo/Alastair Grant)
CORRECTING TITLE FROM PRINCESS TO DUCHESS OF CAMBRIDGE- Britain's Prince William, center, and Kate, Duchess of Cambridge, arrive on the day one of the annual Royal Ascot horse race meeting in Ascot, England, Tuesday, June 18, 2019. (AP Photo/Alastair Grant)
The Duchess of Cambridge attending day one of Royal Ascot at Ascot Racecourse.
The Duchess of Cambridge (left) speaks to Zara Tindall whilst attending day one of Royal Ascot at Ascot Racecourse.
The Duchess of Cambridge during day one of Royal Ascot at Ascot Racecourse.
King Willem-Alexander of the Netherlands (left), Queen Maxima of the Netherlands, the Duke of Cambridge, the Duchess of Cambridge, the Duchess of Cornwall and the Prince of Wales during day one of Royal Ascot at Ascot Racecourse. (Photo by Jonathan Brady/PA Images via Getty Images)
The Duchess of Cambridge arriving during day one of Royal Ascot at Ascot Racecourse.
ASCOT, ENGLAND - JUNE 18: Catherine, Duchess of Cambridge on day one of Royal Ascot at Ascot Racecourse on June 18, 2019 in Ascot, England. (Photo by Mark Cuthbert/UK Press via Getty Images)
The Duchess of Cambridge (left) and the Duchess of Cornwall during day one of Royal Ascot at Ascot Racecourse.
Britain's Prince William, Duke of Cambridge, (L) and Britain's Catherine, Duchess of Cambridge, (R) attend on day one of the Royal Ascot horse racing meet, in Ascot, west of London, on June 18, 2019. - The five-day meeting is one of the highlights of the horse racing calendar. Horse racing has been held at the famous Berkshire course since 1711 and tradition is a hallmark of the meeting. Top hats and tails remain compulsory in parts of the course while a daily procession of horse-drawn carriages brings the Queen to the course. (Photo by Adrian DENNIS / AFP) (Photo credit should read ADRIAN DENNIS/AFP/Getty Images)
The Duchess of Cambridge (left) and the Duchess of Cornwall arriving by carriage on day one of Royal Ascot at Ascot Racecourse. (Photo by Jonathan Brady/PA Images via Getty Images)
ASCOT, ENGLAND - JUNE 18: Catherine, Duchess of Cambridge on day one of Royal Ascot at Ascot Racecourse on June 18, 2019 in Ascot, England. (Photo by Mark Cuthbert/UK Press via Getty Images)
ASCOT, ENGLAND - JUNE 18: Catherine, Duchess of Cambridge on day one of Royal Ascot at Ascot Racecourse on June 18, 2019 in Ascot, England. (Photo by Mark Cuthbert/UK Press via Getty Images)
Britain's Catherine, Duchess of Cambridge, (L) and Zara Phillips (R) attend on day one of the Royal Ascot horse racing meet, in Ascot, west of London, on June 18, 2019. - The five-day meeting is one of the highlights of the horse racing calendar. Horse racing has been held at the famous Berkshire course since 1711 and tradition is a hallmark of the meeting. Top hats and tails remain compulsory in parts of the course while a daily procession of horse-drawn carriages brings the Queen to the course. (Photo by Adrian DENNIS / AFP) (Photo credit should read ADRIAN DENNIS/AFP/Getty Images)
The Duke of Cambridge (left), Queen Elizabeth II, the Duchess of Cambridge, the Duchess of Cornwall, King Willem-Alexander of the Netherlands and Queen Maxima of the Netherlands during day one of Royal Ascot at Ascot Racecourse. (Photo by Jonathan Brady/PA Images via Getty Images)
King Willem-Alexander of the Netherlands (left), Queen Maxima of the Netherlands, the Duke of Cambridge, the Duchess of Cambridge, the Duchess of Cornwall and the Prince of Wales during day one of Royal Ascot at Ascot Racecourse. (Photo by Jonathan Brady/PA Images via Getty Images)
King Willem-Alexander of the Netherlands (left), Queen Maxima of the Netherlands, the Duke of Cambridge, the Duchess of Cambridge, the Duchess of Cornwall and the Prince of Wales during day one of Royal Ascot at Ascot Racecourse. (Photo by Jonathan Brady/PA Images via Getty Images)
ASCOT, ENGLAND - JUNE 18: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge on day one of Royal Ascot at Ascot Racecourse on June 18, 2019 in Ascot, England. (Photo by Mark Cuthbert/UK Press via Getty Images)
ASCOT, ENGLAND - JUNE 18: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge on day one of Royal Ascot at Ascot Racecourse on June 18, 2019 in Ascot, England. (Photo by Mark Cuthbert/UK Press via Getty Images)
ASCOT, ENGLAND - JUNE 18: King Willem-Alexander of the Netherlands and Queen Maxima of the Netherlands with Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge on day one of Royal Ascot at Ascot Racecourse on June 18, 2019 in Ascot, England. (Photo by Mark Cuthbert/UK Press via Getty Images)
Britain's Prince William, Duke of Cambridge, (L) and Britain's Catherine, Duchess of Cambridge, (R) attend on day one of the Royal Ascot horse racing meet, in Ascot, west of London, on June 18, 2019. - The five-day meeting is one of the highlights of the horse racing calendar. Horse racing has been held at the famous Berkshire course since 1711 and tradition is a hallmark of the meeting. Top hats and tails remain compulsory in parts of the course while a daily procession of horse-drawn carriages brings the Queen to the course. (Photo by Adrian DENNIS / AFP) (Photo credit should read ADRIAN DENNIS/AFP/Getty Images)
ASCOT, ENGLAND - JUNE 18: Catherine, Duchess of Cambridge and Camilla, Duchess of Cornwall on day one of Royal Ascot at Ascot Racecourse on June 18, 2019 in Ascot, England. (Photo by Mark Cuthbert/UK Press via Getty Images)
ASCOT, ENGLAND - JUNE 18: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge on day one of Royal Ascot at Ascot Racecourse on June 18, 2019 in Ascot, England. (Photo by Mark Cuthbert/UK Press via Getty Images)
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The royal mom-of-three opted for a striking cornflower blue lace dress for the occasion, which she paired with a matching Philip Treacy hat embroidered with flower detailing. The custom Elie Saab dress is from the designer's Resort 2019 collection -- a short-sleeved version is available for purchase.

The duchess accessorized the look with a pair of matching earrings, an elegant updo and her engagement ring. 

As noted by Harper's Bazaar, Kate's look on Tuesday is a major shakeup from past years. The duchess has only attended the event twice since marrying into the royal family, and both times opted for a simple white lace dress. 

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Royal family at the Royal Ascot
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Royal family at the Royal Ascot
The Duke of Cambridge (left), the Duchess of Cambridge, Queen Elizabeth II, the Duchess of Cornwall, King Willem-Alexander of the Netherlands and Queen Maxima of the Netherlands attending day one of Royal Ascot at Ascot Racecourse.
Princess Eugenie of York (left) and Princess Beatrice of York during day one of Royal Ascot at Ascot Racecourse. (Photo by Mike Egerton/PA Images via Getty Images)
Queen Elizabeth II (left), King Willem-Alexander of the Netherlands, Queen Maxima of the Netherlands, the Duke of Cambridge and the Duchess of Cambridge attending day one of Royal Ascot at Ascot Racecourse.
The Duchess of Cambridge (centre), Johnny Weatherby (right) and Zara Tindall (left) attending day one of Royal Ascot at Ascot Racecourse. (Photo by Jonathan Brady/PA Images via Getty Images)
The Princess Royal (left) and the Countess of Wessex during day one of Royal Ascot at Ascot Racecourse. (Photo by Mike Egerton/PA Images via Getty Images)
ASCOT, ENGLAND - JUNE 18: Emma Weymouth and Lady Kitty Spencer attend day 1 of Royal Ascot at Ascot Racecourse on June 18, 2019 in Ascot, England. (Photo by David M. Benett/Getty Images for Ascot Racecourse)
The Princess Royal, Anne (fourth left), The Duchess of Cambridge, Duke of Cambridge, Queen Elizabeth II, King Willem-Alexander of the Netherlands and Queen Maxima of the Netherlands attending day one of Royal Ascot at Ascot Racecourse.
Queen Elizabeth II during day one of Royal Ascot at Ascot Racecourse.
Britain's Queen Elizabeth II (2R) rise with Dutch King Willem-Alexander (L) and Queen Maxima (R) and Britain's Prince Andrew, Duke of York, (2L) as they arrive on day one of the Royal Ascot horse racing meet, in Ascot, west of London, on June 18, 2019. - The five-day meeting is one of the highlights of the horse racing calendar. Horse racing has been held at the famous Berkshire course since 1711 and tradition is a hallmark of the meeting. Top hats and tails remain compulsory in parts of the course while a daily procession of horse-drawn carriages brings the Queen to the course. (Photo by Adrian DENNIS / AFP) (Photo credit should read ADRIAN DENNIS/AFP/Getty Images)
Princess Eugenie in Windsor Great Park where members of the Royal family swap from cars to horse-drawn carriages on their journey from Windsor Castle to Ascot Racecourse.
The Duchess of Cambridge in Windsor Great Park where members of the Royal family swap from cars to horse-drawn carriages on their journey from Windsor Castle to Ascot Racecourse.
The Princess Royal in Windsor Great Park where members of the Royal family swap from cars to horse-drawn carriages on their journey from Windsor Castle to Ascot Racecourse.
Queen Elizabeth II in Windsor Great Park where members of the Royal family swap from cars to horse-drawn carriages on their journey from Windsor Castle to Ascot Racecourse.
The Duchess of Cambridge (left) and the Duchess of Cornwall in Windsor Great Park where members of the Royal family swap from cars to horse-drawn carriages on their journey from Windsor Castle to Ascot Racecourse.
Queen Elizabeth II in Windsor Great Park where members of the Royal family swap from cars to horse-drawn carriages on their journey from Windsor Castle to Ascot Racecourse.
Queen Elizabeth II during day one of Royal Ascot at Ascot Racecourse.
The Duchess of Cornwall (centre), the Prince of Wales (third left) and the Duke of Cambridge during day one of Royal Ascot at Ascot Racecourse.
The Duke of Cambridge (left), the Duchess of Cambridge, Queen Elizabeth II, the Duchess of Cornwall, King Willem-Alexander of the Netherlands and Queen Maxima of the Netherlands attending day one of Royal Ascot at Ascot Racecourse.
The Duke of Cambridge (centre) arriving by carriage during day one of Royal Ascot at Ascot Racecourse.
The Duchess of Cornwall (centre), the Prince of Wales (third left) and the Duke of Cambridge during day one of Royal Ascot at Ascot Racecourse.
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Joining in on today's festivities were other members of the royal family, including Princess Eugenie and Princess Beatrice, who both wore bright blue, Princess Anne and the Tindalls. The queen also arrived at the elegant soirée by carriage alongside Queen Maxima of the Netherlands, who likewise attended Monday's Order of the Garter

While the Duchess of Sussex made her royal debut at last year's Ascot, she's expected to skip out on this year's event as she is still on maternity leave. 

For more on the event, watch the video above! 

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Meghan Markle makes Royal Ascot debut
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Meghan Markle makes Royal Ascot debut
ASCOT, ENGLAND - JUNE 19: Prince Harry, Duke of Sussex and Meghan, Duchess of Sussex attend Royal Ascot Day 1 at Ascot Racecourse on June 19, 2018 in Ascot, United Kingdom. (Photo by Mark Cuthbert/UK Press via Getty Images)
ASCOT, ENGLAND - JUNE 19: Prince Harry, Duke of Sussex and Meghan, Duchess of Sussex attend Royal Ascot Day 1 at Ascot Racecourse on June 19, 2018 in Ascot, United Kingdom. (Photo by Mark Cuthbert/UK Press via Getty Images)
ASCOT, ENGLAND - JUNE 19: Sophie, Countess of Wessex, Meghan, Duchess of Sussex and Prince Edward, Earl of Wessex attend day 1 of Royal Ascot at Ascot Racecourse on June 19, 2018 in Ascot, England. (Photo by Charlie Crowhurst/Getty Images for Ascot Racecourse)
The Duke and Duchess of Sussex and Sophie the Countess of Wessex (centre) during day one of Royal Ascot at Ascot Racecourse. (Photo by John Walton/PA Images via Getty Images)
The Duke and Duchess of Sussex alongside trainer John Warren (left) during day one of Royal Ascot at Ascot Racecourse. (Photo by John Walton/PA Images via Getty Images)
ASCOT, ENGLAND - JUNE 19: Meghan, Duchess of Sussex attends Royal Ascot Day 1 at Ascot Racecourse on June 19, 2018 in Ascot, United Kingdom. (Photo by Samir Hussein/Samir Hussein/WireImage)
ASCOT, ENGLAND - JUNE 19: Meghan, Duchess of Sussex and Prince Harry, Duke of Sussex attend Royal Ascot Day 1 at Ascot Racecourse on June 19, 2018 in Ascot, United Kingdom. (Photo by Chris Jackson/Getty Images)
Sophie, Countess of Wessex (centre) and Meghan, Duchess of Sussex with Prince Harry, Duke of Sussex arriving during day one of Royal Ascot at Ascot Racecourse. (Photo by Steve Parsons/PA Images via Getty Images)
ASCOT, ENGLAND - JUNE 19: Meghan, Duchess of Sussex and Prince Harry, Duke of Sussex attend Royal Ascot Day 1 at Ascot Racecourse on June 19, 2018 in Ascot, United Kingdom. (Photo by Samir Hussein/Samir Hussein/WireImage)
ASCOT, ENGLAND - JUNE 19: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 24 HOURS AFTER CREATE DATE AND TIME) Meghan, Duchess of Sussex and Prince Harry, Duke of Sussex attend Royal Ascot Day 1 at Ascot Racecourse on June 19, 2018 in Ascot, United Kingdom. (Photo by Karwai Tang/WireImage)
The Queen's racing manager John Warren (left) with Meghan, Duchess of Sussex with Prince Harry, Duke of Sussex during day one of Royal Ascot at Ascot Racecourse. (Photo by Steve Parsons/PA Images via Getty Images)
ASCOT, ENGLAND - JUNE 19: Meghan, Duchess of Sussex and Sophie, Countess of Wessex attend Royal Ascot Day 1 at Ascot Racecourse on June 19, 2018 in Ascot, United Kingdom. (Photo by Mark Cuthbert/UK Press via Getty Images)
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