The diamond and pearl-encrusted accessory was reportedly given to Diana by the queen as a wedding present in 1981.
The Duchess of Cambridge has paid the ultimate tribute to Princess Diana by wearing one of her favourite tiaras; a family heirloom that has been passed down the royal generations.
The Duke and Duchess of Cambridge arrive for the annual evening reception for members of the Diplomatic Corps at Buckingham Palace, London.
The unprecedented image of the "magnificent six", which includes the Queen and her husband the Duke of Edinburgh, her direct inheritor, Prince Charles and his wife, the Duchess of Cornwall. The stunning piece was created by jewelers Garrard in 1914 for Queen Mary, from pearls and diamonds already in her family's possession. In the latest episode of their rumored enmity, the two has a disagreement over Christmas celebration arrangements this time. Designed by her go-to occasion designer, Jenny Packham, the glittering dress was first worn at a state banquet for the Chinese President in October 2015. While attending an event honoring Britain's diplomats, Middleton wore Diana's famous Lover's Knot tiara, which Queen Elizabeth originally gave to Princess Diana as a wedding gift. William, along with his father Prince Charles and grandfather Prince Philip, each wore formal jackets and sashes that showed off their military medals.
Of course Prince William was no slouch, looking fancy in his uniform. Like Middleton, the Queen and Duchess of Cornwall were rocking sparkly tiaras of their own!
White-tie Diplomatic Reception is one of the highlights of the royal calendar, the main social event of the year.