Stella McCartney after being made a Commander of the Order of the British Empire by King Charles III during an investiture ceremony at Windsor Castle on February 7, 2023 in Windsor, England. (Photo by Pool/Getty Images)

Eco-friendly fashion designer Stella McCartney stopped by Windsor Castle on Tuesday afternoon to receive a new, prestigious honor. Fellow environmental activist King Charles III granted the designer with the Commander of the Order of the British Empire (CBE), for her services to fashion and sustainability.

McCartney chose a custom, tailored navy long-sleeve midi dress for the occasion, crafted in her London atelier from regenerative Nativa traceable wool, with the foremost levels of animal welfare and environmental protection in place, keeping farmers and local communities in mind. She accessorized with navy pumps, matching stockings, a Stella McCartney Collection clutch and custom lace potted birdcage veil from British milliner Emily-London.

King Charles was seen cracking a huge smile while honoring McCartney. The designer posted a photo of the event on Instagram with the caption, “Humbled to be honored by His Majesty King Charles III today and also to have been included in Her Majesty Queen Elizabeth II’s final Birthday Honors.”

Last summer, McCartney received official accolades from the late Queen Elizabeth II during the monarch’s annual Birthday Honors list ahead of her Platinum Jubilee celebrations. “Proud for this recognition of my work in fashion, sustainability and beyond,” she continued.

Last September, McCartney shared a photo of herself and the Queen in honor of the monarch’s passing. “A moment I will never forget, with a woman who will be remembered forever. She inspired generations of girls around the world, including me. Thank you, Your Majesty,” she wrote.

McCartney was also honored with the Order of the British Empire award in 2013 from Queen Elizabeth at Buckingham Palace.

The designer and the royal have worked together on multiple occasions in tune with their shared passion for sustainability and environmentalism.

McCartney met with Charles for the first time since the Queen’s passing and his ascension to the throne in November, when they attended a reception for world leaders, business figures and environmentalists at Buckingham Palace, ahead of the COP27 Summit in Egypt to discuss sustainable growth and the continued efforts to combat climate change. The two shared a sweet moment when McCartney greeted the King of England and British Prime Minister Rishi Sunak.

Britain’s King Charles III (L) speaks with Britain’s Prime Minister Rishi Sunak (2nd L) and British fashion designer Stella McCartney (R) at a reception for world leaders, business figures, environmentalists and NGOs at Buckingham Palace in London, on November 4, 2022. (Photo by JONATHAN BRADY/POOL/AFP via Getty Images)

“Your Majesty, I don’t know what to do anymore,” said McCartney, going in for a handshake, then a kiss on the cheek. “I think I’m supposed to do this now,” she said as she curtsied. “I’ve been practicing.”

Previously, the two have worked together during the G7 summit in Cornwall, England in 2021. McCartney also gave then-Prince Charles a tour of the sustainable fashion installation she made for the COP26 summit and the United Nations Climate Conference in Glasgow, Scotland, that same year.