King Charles and Queen Camilla hosted the Japanese royals at a glitzy State Banquet as Kate and Princess Anne were absent.
The Emperor and Empress of Japan are visiting the UK on a State Visit, beginning their trip with an official arrival ceremony on Horse Guards Parade today.
This involved a carriage parade down The Mall and arrival at Buckingham Palace.
This evening, the King, 75, and Queen, 76, hosted a State Banquet in honour of their guests in the Palace’s Ballroom.
Kate, 42, and Princess Anne, 73, were not in attendance due to various health concerns.
The Princess of Wales has temporarily stepped back from public life while she continues to receive cancer treatment.
Meanwhile, the Princess Royal was hospitalised on Sunday following a concussion after she suffered a blow to the head.
Queen Camilla looked glamorous this evening in a cream silk crepe embroidered dress, designed by Fiona Clare.
The mother-of-two further accessorised with the Burmese ruby and diamond tiara, a diamond necklace, and ruby and diamond earrings.
Camilla also wore a ruby and diamond bracelet, along with King Charles III's Family Order.
This was seen for the first time on Tuesday evening, after being worn by the Queen.
The tradition of commissioning a Family Order, a badge worn by female members of the Royal Family personally bestowed by the Sovereign, was first established by King George IV over 200 years ago.
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Family Orders have since been instituted by Queen Victoria, King Edward VII, King George V, King George VI and Queen Elizabeth II.
The badge normally features a portrait of the Sovereign surrounded by diamonds and is suspended from a silk bow.
Family Orders are worn pinned to the left shoulder on formal evening occasions when other orders and decorations are worn.