The monarch, 76, held the reception to recognise the humanitarian efforts of a number of people, including His Dark Materials actress Ruth Wilson and presenter Fern Britton.
Samantha Niblett, the MP for South Derbyshire drove to meet the King and Queen at the Palace in a white Abarth 500, which was overdue its annual check-up by ten days.
The major spring tour, which has long been trailed in the media, will take place in early April and coincides with Charles and Camilla's 20th wedding anniversary .
The legendary editor-in-chief of American Vogue was made a Companion of Honour in the 2023 King's Birthday Honours list for her contributions to fashion.