The King and Queen led the senior royals as they hosted a glittering state banquet for the Emir of Qatar at Buckingham Palace on Tuesday evening.
Charles, 76, and Camilla, 77, posed for photographs with Sheikh Tamim bin Hamad Al Thani and the first of his three wives, Sheikha Jawaher at the start of the white-tie dinner.
Their Majesties were joined by the Prince of Wales, the Duke and Duchess of Edinburgh, the Princess Royal and the Duke and Duchess of Gloucester - and surprise guests, David and Victoria Beckham. Watch their arrival below...
WATCH: Victoria and David Beckham make surprise appearance at state banquet with royals
Kate is making a gradual return to her royal duties amid her recovery from cancer, and will host her annual Christmas carol service at Westminster Abbey on Friday 6 December.
She and Prince William greeted the Emir and Sheikha Jawaher at their private residence and accompanied them to meet the King for the ceremonial welcome at Horse Guards Parade on Tuesday morning.
The Queen wore the late Queen Elizabeth II's Diamond Kokoshnik tiara for the first time, which hasn't been seen for nearly a decade.
The jewels were a 25th wedding anniversary gift to Queen Alexandra in 1888.
It was passed down to her daughter-in-law Queen Mary, who then passed it down to the Queen Elizabeth II.
Camilla teamed the jewels with a red velvet evening dress by Fiona Claire.
Her diamond earrings were from her private collection and her diamond necklace also belonged to Elizabeth II.
She also wore a ruby and diamond bracelet and the family orders of both the late Queen and King Charles III – miniature portraits of the monarchs on ribbons.
David and Victoria Beckham were among the 170 guests at the banquet.
The former footballer, dapperly dressed in white tie and tails, chatted to Victoria as they made their way through the East Gallery.
The fashion designer and former Spice Girl was dressed in a fitted dark floor-length evening gown with long fitted sleeves and wore her hair swept into a sleek pony tail.
The King opened his toast by speaking in Arabic, as he hailed the "profound, personal and historic" ties between Qatar and the UK.
LISTEN: Inside Princess Kate's carol service plans
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