Kate Middleton glows in white Catherine Walker for royal-studded Order of the Garter ceremony

It's a royal affair! 

The royal family kicked off their week by attending the annual Order of the Garter ceremony on Monday morning at St. George's Chapel, Windsor. The tradition, which was founded 700 years ago by King Arthur, is considered "the oldest and most senior Order of Chivalry" in Britain.

To no surprise, this year's ceremony featured an impressive list of attendees, including Queen Elizabeth, Prince William and Duchess Kate, Prince Charles and the Duchess of Cornwall, the Countess of Wessex, the King and Queen of Spain and the King and Queen of Netherlands. King Felipe and King Willem-Alexander were installed as Supernumerary Knights of the Garter by the queen during this year's ceremony. 

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Kate Middleton glows in white at Order of Garter
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Kate Middleton glows in white at Order of Garter
WINDSOR, ENGLAND - JUNE 17: Queen Letizia of Spain and Catherine, Duchess of Cambridge leave the Order of the Garter Service on June 17, 2019 in Windsor, England. The Order of the Garter is the senior and oldest British Order of Chivalry, founded by Edward III in 1348. The Garter ceremonial dates from 1948, when formal installation was revived by King George VI for the first time since 1805. (Photo by Frank Augstein - WPA Pool/Getty Images)
WINDSOR, ENGLAND - JUNE 17: Queen Maxima of the Netherlands and Catherine, Duchess of Cambridge at the Order of the Garter Service at St George's Chapel in Windsor Castle on June 17, 2019 in Windsor, England. The Order of the Garter is the senior and oldest British Order of Chivalry, founded by Edward III in 1348. The Garter ceremonial dates from 1948, when formal installation was revived by King George VI for the first time since 1805. (Photo by Steve Parsons - WPA Pool/Getty Images)
WINDSOR, ENGLAND - JUNE 17: Queen Maxima of the Netherlands and Catherine, Duchess of Cambridge leave the Order of the Garter Service on June 17, 2019 in Windsor, England. The Order of the Garter is the senior and oldest British Order of Chivalry, founded by Edward III in 1348. The Garter ceremonial dates from 1948, when formal installation was revived by King George VI for the first time since 1805. (Photo by Ben Stansall - WPA Pool/Getty Images)
WINDSOR, ENGLAND - JUNE 17: Queen Letizia of Spain and Catherine, Duchess of Cambridge leaves the Order of the Garter Service at St George's Chapel in Windsor Castle on June 17, 2019 in Windsor, England. The Order of the Garter is the senior and oldest British Order of Chivalry, founded by Edward III in 1348. The Garter ceremonial dates from 1948, when formal installation was revived by King George VI for the first time since 1805. (Photo by Steve Parsons - WPA Pool/Getty Images)
WINDSOR, ENGLAND - JUNE 17: Queen Letizia of Spain and Catherine, Duchess of Cambridge at the Order of the Garter Service at St George's Chapel in Windsor Castle on June 17, 2019 in Windsor, England. The Order of the Garter is the senior and oldest British Order of Chivalry, founded by Edward III in 1348. The Garter ceremonial dates from 1948, when formal installation was revived by King George VI for the first time since 1805. (Photo by Steve Parsons - WPA Pool/Getty Images)
WINDSOR, ENGLAND - JUNE 17: Catherine, Duchess of Cambridge, Prince William, Duke of Cambridge, King Felipe of Spain and Queen Letizia of Spain leave the Order of the Garter Service on June 17, 2019 in Windsor, England. The Order of the Garter is the senior and oldest British Order of Chivalry, founded by Edward III in 1348. The Garter ceremonial dates from 1948, when formal installation was revived by King George VI for the first time since 1805. (Photo by Ben Stansall - WPA Pool/Getty Images)
WINDSOR, ENGLAND - JUNE 17: Queen Letizia of Spain, Camilla, Duchess of Cornwall and Catherine, Duchess of Cambridge at the Order of the Garter Service at St George's Chapel in Windsor Castle on June 17, 2019 in Windsor, England. The Order of the Garter is the senior and oldest British Order of Chivalry, founded by Edward III in 1348. The Garter ceremonial dates from 1948, when formal installation was revived by King George VI for the first time since 1805. (Photo by Steve Parsons - WPA Pool/Getty Images)
WINDSOR, ENGLAND - JUNE 17: Catherine, Duchess of Cambridge at the Order of the Garter Service at St George's Chapel in Windsor Castle on June 17, 2019 in Windsor, England. The Order of the Garter is the senior and oldest British Order of Chivalry, founded by Edward III in 1348. The Garter ceremonial dates from 1948, when formal installation was revived by King George VI for the first time since 1805. (Photo by Steve Parsons - WPA Pool/Getty Images)
Ntherlands' Queen Maxima and Britain's Catherine, Duchess of Cambridge watch the procession to St George's Chapel to for the Most Noble Order of the Garter Ceremony in Windsor Castle in Windsor, west of London on June 17, 2019. - The Order of the Garter is the oldest and most senior Order of Chivalry in Britain, established by King Edward III nearly 700 years ago. (Photo by Steve Parsons / POOL / AFP) (Photo credit should read STEVE PARSONS/AFP/Getty Images)
WINDSOR, ENGLAND - JUNE 17: King Felipe of Spain, Queen Letizia of Spain, Prince William, Duke of Cambridge and Catherine Duchess of Cambridge attends the Order of the Garter Service at St George's Chapel in Windsor Castle on June 17, 2019 in Windsor, England. The Order of the Garter is the senior and oldest British Order of Chivalry, founded by Edward III in 1348. The Garter ceremonial dates from 1948, when formal installation was revived by King George VI for the first time since 1805. at St George's Chapel on June 17, 2019 in Windsor, England. (Photo by Patrick van Katwijk/Getty Images)
Netherlands' King Willem-Alexander (L) and Queen Maxima (C) stand with Britain's Catherine, Duchess of Cambridge as they leave from St George's Chapel after attending the Most Noble Order of the Garter Ceremony in Windsor Castle in Windsor, west of London on June 17, 2019. - The Order of the Garter is the oldest and most senior Order of Chivalry in Britain, established by King Edward III nearly 700 years ago. (Photo by Frank Augstein / POOL / AFP) (Photo credit should read FRANK AUGSTEIN/AFP/Getty Images)
WINDSOR, ENGLAND - JUNE 17: King Willem-Alexander of The Netherlands, King Felipe of Spain, Queen Maxima of The Netherlands, Queen Letizia of Spain, Camilla, Duchess of Cornwall and Catherine, Duchess of Cambridge attends the Order of the Garter Service at St George's Chapel in Windsor Castle on June 17, 2019 in Windsor, England. The Order of the Garter is the senior and oldest British Order of Chivalry, founded by Edward III in 1348. The Garter ceremonial dates from 1948, when formal installation was revived by King George VI for the first time since 1805. at St George's Chapel on June 17, 2019 in Windsor, England. (Photo by Patrick van Katwijk/Getty Images)
Netherlands' King Willem-Alexander and Queen Maxima talk with Britain's Catherine, Duchess of Cambridge as they leave from St George's Chapel after attending the Most Noble Order of the Garter Ceremony in Windsor Castle in Windsor, west of London on June 17, 2019. - The Order of the Garter is the oldest and most senior Order of Chivalry in Britain, established by King Edward III nearly 700 years ago. (Photo by Frank Augstein / POOL / AFP) (Photo credit should read FRANK AUGSTEIN/AFP/Getty Images)
WINDSOR, ENGLAND - JUNE 17: King Willem-Alexander of the Netherlands, Queen Maxima of the Netherlands and Catherine, Duchess of Cambridge leave the Order of the Garter Service on June 17, 2019 in Windsor, England. The Order of the Garter is the senior and oldest British Order of Chivalry, founded by Edward III in 1348. The Garter ceremonial dates from 1948, when formal installation was revived by King George VI for the first time since 1805. (Photo by Frank Augstein - WPA Pool/Getty Images)
WINDSOR, ENGLAND - JUNE 17: Queen Letizia of Spain (L) talks with Prince William, Duke of Cambridge (C) and Catherine, Duchess of Cambridge as they leave the Order of the Garter Service on June 17, 2019 in Windsor, England. The Order of the Garter is the senior and oldest British Order of Chivalry, founded by Edward III in 1348. The Garter ceremonial dates from 1948, when formal installation was revived by King George VI for the first time since 1805. (Photo by Ben Stansall - WPA Pool/Getty Images)
WINDSOR, ENGLAND - JUNE 17: Sophie, Countess of Wessex, Queen Letizia of Spain, Camilla, Duchess of Cornwall, Queen Maxima of the Netherlands and Catherine, Duchess of Cambridge at the Order of the Garter Service at St George's Chapel in Windsor Castle on June 17, 2019 in Windsor, England. The Order of the Garter is the senior and oldest British Order of Chivalry, founded by Edward III in 1348. The Garter ceremonial dates from 1948, when formal installation was revived by King George VI for the first time since 1805. (Photo by Steve Parsons - WPA Pool/Getty Images)
Britain's Prince William (R) and Britain's Catherine, Duchess of Cambridge, (2L) ride with Spain's King Felipe VI (2R) and Queen Letizia (L) as they leave following the Order of the Garter Service at St George's Chapel in Windsor Castle on June 17, 2019. - The Order of the Garter is the oldest and most senior Order of Chivalry in Britain, established by King Edward III nearly 700 years ago. Appointment to the order is solely in the gift of the Monarch and is limited to the Sovereign, the Prince of Wales, and no more than 24 members or Companions. (Photo by PETER NICHOLLS / POOL / AFP) (Photo credit should read PETER NICHOLLS/AFP/Getty Images)
Netherlands' Queen Maxima (L) talks with Britain's Catherine, Duchess of Cambridge as they leave from St George's Chapel after attending the Most Noble Order of the Garter Ceremony in Windsor Castle in Windsor, west of London on June 17, 2019. - The Order of the Garter is the oldest and most senior Order of Chivalry in Britain, established by King Edward III nearly 700 years ago. (Photo by Ben STANSALL / various sources / AFP) (Photo credit should read BEN STANSALL/AFP/Getty Images)
Spain's Queen Letizia (L) talks with Britain's Prince William, Duke of Cambridge (C) and Britain's Catherine, Duchess of Cambridge as they leave from St George's Chapel after attending the Most Noble Order of the Garter Ceremony in Windsor Castle in Windsor, west of London on June 17, 2019. - The Order of the Garter is the oldest and most senior Order of Chivalry in Britain, established by King Edward III nearly 700 years ago. (Photo by Ben STANSALL / various sources / AFP) (Photo credit should read BEN STANSALL/AFP/Getty Images)
WINDSOR, ENGLAND - JUNE 17: Queen Maxima of The Netherlands, Queen Letizia of Spain, Camilla, Duchess of Cornwall and Catherine, Duchess of Cambridge during Order of the Garter Service at St George's Chapel in Windsor Castle on June 17, 2019 in Windsor, England. (Photo by Patrick van Katwijk/Getty Images)
Britain's Camilla, Duchess of Cornwall (L), Netherlands' Queen Maxima (C) and Britain's Catherine, Duchess of Cambridge watch Members of the Order of the Garter process to the ceremony at St George's Chapel at Windsor Castle in Windsor, west of London on June 17, 2019. - The Order of the Garter is the oldest and most senior Order of Chivalry in Britain, established by King Edward III nearly 700 years ago. (Photo by Steve Parsons / POOL / AFP) (Photo credit should read STEVE PARSONS/AFP/Getty Images)
WINDSOR, ENGLAND - JUNE 17: Sophie, Countess of Wessex, Queen Letizia of Spain, Camilla, Duchess of Cornwall, Queen Maxima of the Netherlands and Catherine, Duchess of Cambridge at the Order of the Garter Service at St George's Chapel in Windsor Castle on June 17, 2019 in Windsor, England. The Order of the Garter is the senior and oldest British Order of Chivalry, founded by Edward III in 1348. The Garter ceremonial dates from 1948, when formal installation was revived by King George VI for the first time since 1805. (Photo by Steve Parsons - WPA Pool/Getty Images)
WINDSOR, ENGLAND - JUNE 17: Camilla, Duchess of Cornwall and Catherine, Duchess of Cambridge at the Order of the Garter Service at St George's Chapel in Windsor Castle on June 17, 2019 in Windsor, England. The Order of the Garter is the senior and oldest British Order of Chivalry, founded by Edward III in 1348. The Garter ceremonial dates from 1948, when formal installation was revived by King George VI for the first time since 1805. (Photo by Steve Parsons - WPA Pool/Getty Images)
WINDSOR, ENGLAND - JUNE 17: Camilla, Duchess of Cornwall, Queen Maxima of the Netherlands and Catherine, Duchess of Cambridge at the Order of the Garter Service at St George's Chapel in Windsor Castle on June 17, 2019 in Windsor, England. The Order of the Garter is the senior and oldest British Order of Chivalry, founded by Edward III in 1348. The Garter ceremonial dates from 1948, when formal installation was revived by King George VI for the first time since 1805. (Photo by Steve Parsons - WPA Pool/Getty Images)
WINDSOR, ENGLAND - JUNE 17: Sophie, Countess of Wessex, Queen Letizia of Spain, Camilla, Duchess of Cornwall, Queen Maxima of the Netherlands and Catherine, Duchess of Cambridge at the Order of the Garter Service at St George's Chapel in Windsor Castle on June 17, 2019 in Windsor, England. The Order of the Garter is the senior and oldest British Order of Chivalry, founded by Edward III in 1348. The Garter ceremonial dates from 1948, when formal installation was revived by King George VI for the first time since 1805. (Photo by Steve Parsons - WPA Pool/Getty Images)
Spain's Queen Letizia and Britain's Kate, the Duchess of Cambridge leave the Order of The Garter Service at Windsor Castle in Windsor, Monday, June 17, 2019. Windsor Castle plays host to the annual Order of the Garter Service, held in St. George's Chapel, which celebrates the traditions and ideals associated with the Most Noble Order of the Garter, the oldest surviving order of chivalry in the world. (AP Photo/Frank Augstein, Pool)
Queen Maxima of the Netherlands, left, and Kate, Duchess of Cambridge after the annual Order of the Garter Service at St George's Chapel, Windsor Castle in Windsor, England, Monday, June 17, 2019. (Ben Stansall/Pool Photo via AP)
Queen Maxima of the Netherlands and Britain's Kate, Duchess of Cambridge stand together as they watch the annual Order of the Garter Service at St George's Chapel, Windsor Castle in Windsor, England, Monday, June 17, 2019. (Steve Parsons/Pool Photo via AP)
From left, Britain's Camilla, the Duchess of Cornwal, Queen Maxima of the Netherlands and Britain's Kate, the Duchess of Cambridge, watch the annual Order of the Garter Service at St George's Chapel, Windsor Castle, England, Monday, June 17, 2019. (Steve Parsons/PA via AP)
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While the Duchess of Cambridge was there to cheer on her husband as Prince William took part in the parade, all eyes were actually on the royal mom-of-three during the royal-packed event. Kate, who made her Garter Day debut 11 years ago, stole the show in a white and black Catherine Walker coat and matching hat by Lock & Co.

The Duke and Duchess of Cambridge are also expected to step out for the 2019 Royal Ascot this week. The annual extravaganza will bring together 300,000 visitors over the course of five days, including many members of the royal family. 

For more on last year's event, scroll through below. 

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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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