The Duke and Duchess of Cambridge attended the Diplomatic Reception this evening.
Hosted by The Queen at Buckingham Palace, the annual white-tie soirée is one of the most formal events on the royal calendar.
Over 1,000 people from around 130 countries, including members of the British government and past Prime Ministers attend the gathering.
Kate looked every inch the princess in a new Alexander McQueen gown.
The custom velvet dress appears to be based on the designer's ready-to-wear Bejeweled Long Sleeve Illusion Gown (US$7,290) featuring the same curved v-neckline and peaked shoulders. Kate's gown does not have the lace insets or the bejeweled back.
The Duchess donned her 'go-to' diadem - the Queen Mary Lover's Knot tiara.
In addition to the tiara, Kate also loaned The Queen's Nizam of Hyderabad necklace. We first saw her wear the piece to the 2014 Portrait Gala.
Kate also accessorized with 'new' diamond chandelier earrings and a matching marquis cluster ring.
The jewels belong to Her Majesty and are part of the Diamond Chandelier Drop Demi-Parure. Below we see the earrings and ring worn by the Queen during a State Visit to Germany in 1992. Their provenance is unknown.
Pinned to Kate's dress was a Royal Family Order of Queen Elizabeth II which she was awarded in 2017 and first seen on the Duchess at the Netherlands state banquet in 2018.
Kate was also decorated with the Royal Victorian Order sash and badge. You may recall The Duchess of Cambridge was appointed Dame Grand Cross of the Royal Victorian Order on her eighth wedding anniversary this April as recognition of her service to the Sovereign. Kate first wore the order to the United States state banquet in June.
SHOP KATE'S CLOSET