Kate Middleton Wears a the Lover’s Knot Tiara to the Queen’s 2018 Diplomatic Reception

Kate Middleton is in full royal mode as she attends the Queen’s Diplomatic Corps Reception at Buckingham Palace tonight. The Duchess of Cambridge was spotted arriving to the formal gathering in the car, and while her dress wasn’t entirely visible from the window, her tiara was in plain sight.

The Duchess wore the Cambridge Lover’s Knot Tiara, one of her go-to royal jeweled headpieces, which was also frequently worn by her late mother-in-law, Princess Diana. The heirloom was first made in 1914 for Queen Mary, Queen Elizabeth II’s grandmother, according to Town & Country.

A first look at Kate arriving for the Diplomatic Reception. https://t.co/57seycidjP pic.twitter.com/aEbnv9ja9u

— Duchess Kate Blog (@HRHDuchesskate) December 4, 2018

Just earlier today, Kate hosted Christmas party at Kensington Palace with Prince William for military families, where she wore a festive tartan skirt and cardigan. She’s undergone quite the wardrobe change since then.

The Queen hosts the Diplomatic Reception annually in early December, honoring foreign diplomats and ambassadors at Buckingham Palace, according to Popsugar. The celebration is one of the most formal royal events of the year, boasting a “white tie” dress code, which explains the crowns, tiaras, and full regalia worn to the festivities.