Kate Middletonwatched proudly as husbandPrince Williamparaded down the walkway of Windsor Castle on Monday for a very royal occasion.

After skippinglast year’s ceremonywhile on maternity leave, Kate was all smiles while William wore the velvet robes and high ostrich plume in his hat for the annual celebration of the Order of the Garter, one of the oldest and most senior order of knighthood in the U.K. The royal mom, 37, wore black and white for the occasion, pairing aCatherine Walker “Liza” coatwith a Lock & Co. hat.

Tim Rooke/Shutterstock

Catherine Duchess of Cambridge Order of the Garter

Prince William and Prince Charles.Tim Rooke/Shutterstock

Prince William, Prince Charles Order of the Garter

William was made a Knight in what is the most senior order of chivalry in the U.K. in 2008. Kate memorably attended the ceremony that year, three years before they married.

Prince Harry and Kate Middleton at Order of Garter ceremony 2008.Tim Graham Picture Library/Getty

Prince Harry and Prince William’s girlfriend Kate Middleton

Kate Middleton and Prince William at Order of Garter ceremony 2014.Arthur Edwards - WPA Pool /Getty

Catherine, Duchess of Cambridge and Sophie, Countess of Wessex watch as Prince William, Duke of Cambridge and Prince Charles, Prince of Wales

Queen Elizabeth.Tim Rooke/Shutterstock

Queen Elizabeth II Order of the Garter

King Felipe of Spain and King Willem-Alexander were at Garter Day, as the Queen installed them as Supernumerary, or “Stranger,” Knights of the Garter during the service at St. George’s Chapel.

King Felipe, Queen Elizabeth and Queen Letizia.Steve Parsons - WPA Pool/Getty

Queen Elizabeth II (C) with King Felipe VI of Spain (L) and Queen Letizia of Spain

King Willem-Alexander, Queen Elizabeth and Queen Maxima.Steve Parsons - WPA Pool/Getty

Queen Elizabeth II (C) with King Willem-Alexander of the Netherlands (C) and Queen Maxima of the Netherlands

King Willem-Alexander joins his mother and former monarch, Princess Beatrix, who was appointed to the order in 1989, while King Felipe’s father, Juan Carlos, was also named a “supernumerary” member. King Harald V of Norway and Emperor Emeritus Akihito of Japan have also been given the honor.

King Willem-Alexander, Queen Maxima and Kate Middleton.

Queen Maxima of the Netherlands and the Duchess of Cambridge, they watch the annual Order of the Garter Service at St George’s Chapel

Sophie Countess of Wessex, Queen Letizia of Spain, Camilla Duchess of Cornwall, Queen Maxima of the Netherlands and Kate Middleton.Press Association via AP

Order of the Garter Service 2019. (left to right) Sophie Countess of Wessex, Queen Letizia of Spain, the Duchess of Cornwall, Queen Maxima of the Netherlands and the Duchess of Cambridge

Queen Letizia, Camilla Duchess of Cornwall and Kate Middleton.Tim Rooke/Shutterstock

Queen Letizia, Camilla Duchess of Cornwall, Catherine Duchess of Cambridge Order of the Garter

Queen Letizia and Kate Middleton.Tim Rooke/Shutterstock

Queen Letizia, Catherine Duchess of Cambridge Order of the Garter

Queen Maxima Order of the Garter

source: people.com