The Spanish royal couple kicked off their three-day visit with a welcoming in London with Queen Elizabeth II and the Duke of Edinburgh.
The 91-year-old has tirelessly carried out her royal duties during a frenetic period in the U.K.
Just shy of his 96th birthday in June, Prince Philip announced his plans to retire from public engagements later this year.
The designer is apparently being honored for her contributions to fashion and her charity work.
The Duke and Duchess of Cambridge joined Queen Elizabeth II for the occasion.
The monarch, who is making a two-day visit on the heels of her 90th birthday celebrations, stayed mum on Brexit.
Middleton wore a pair of Rossi’s nude suede pumps with her Catherine Walker coat.
The monarch sticks with tried-and-true elegant looks that play up her classic style.
See the top tributes from designers and fashion movers and shakers for Queen Elizabeth II’s birthday.