Kate, 36, wore the Royal Family Order of Queen Elizabeth II, an honour given by Her Majesty to female royals, at the glitzy dinner at Buckingham Palace, held in honour of Queen Maxima and King Willem-Alexander.
Kate was especially striking in her late mother-in-law's tiara, a diamonds-and-pearls bauble known as the Cambridge Lover's Knot tiara that Kate has worn before.
It is the second time that Kate has worn the family order, which she was awarded previous year, after its first outing at the Diplomatic Corps reception in December.
Meanwhile, Kate also wore Queen Alexandra's necklace for the first time at last night's state banquet.
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The tiara is over one hundred years old and now belongs to the Queen, though it once belonged to Queen Mary. Having come into her royal stride in 2011, the Duchess of Cambridge now runs her daily engagement style something like sartorial clockwork. But to match its sparkling combination of pearls and diamonds, was a rather impressive necklace never seen on the Duchess before. A number of European royals have visited Britain in recent months as royals on both sides attempt to foster a positive working relationship in preparation life post-Brexit.
Queen Elizabeth II hosted the dinner for King Willem-Alexander and Queen Máxima of the Netherlands.
Visiting for the event were King Willem-Alexander of the Netherlands accompanied by Queen Maxima, who are now staying at the Palace.
The Duchess of Cambridge customised her new royal brooch in a sweet tribute to Prince William - as it is made out of glass instead of ivory. An eye-catching, matching necklace completed the ensemble, which Vogue reported is the same necklace Queen Alexandra wore to her wedding in 1863.
British Prime Minister Theresa May was also on hand.