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.
The royal accessorized her banquet look with an ornate pearl necklace, matching earrings and Princess Diana's iconic Lover's Knot tiara.
Another said they would not have been surprised if she'd borrowed it from the current exhibition of Princess Diana's vintage dresses at Kensington Palace.
Kate also wore some statement jewellery to finish off the ensemble and it's definitely a dazzling effect.
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The jewellery was so stunning it nearly outshone her Alexander McQueen dress, an icy blue-grey taffeta ball gown with a dropped waist falling to a full skirt with a slight train swirling around her feet. But to match its sparkling combination of pearls and diamonds, was a rather impressive necklace never seen on the Duchess before.
The Duchess of Cambridge rarely wears her hair up to hide the scar just next to her hairline.
It was a copy of one owned by her grandmother, Princess Augusta of Hesse, who married the first Duke of Cambridge, seventh son of King George III, in 1818.
"This dress is maybe the worst Kate ever wore".
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Since Queen Mary died in 1953 the Cambridge Lover's Knot tiara has been handed down to Queen Elizabeth II who gifted it to Princess Diana when she Wednesday Prince Charles. "Behold, Kate's dress, the original from the Laura Ashley 1985 bridesmaids collection".
The mother-to-be stunned in an azure blue, cape-sleeved gown, which she accessorized with a glimmering pair of diamond, chandelier earrings and a royal smile.
Prince Harry and Meghan weren't at the state banquet because they're in the midst of their 16-day tour of Australia, New Zealand, Tonga and Fiji, where they arrived on Monday. Prince Charles, the Prince of Wales and Camilla, the Duchess of Cornwall were also on hand for the banquet for 150 guests.
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