Kate glitters in Diana's diamond Cambridge Lover's Knot tiara at state banquet

An eye-catching, matching necklace completed the ensemble, which Vogue reported is the same necklace Queen Alexandra wore to her wedding in 1863.

The Duchess of Cambridge may not be Queen Kate just yet, but her formal Alexander McQueen outfit (plus, that tiara) last night could've fooled us.

While Kate Middleton and Prince William have been enjoying some time away from the spotlight, which has been focused on Prince Harry and Meghan Markle's royal Australian tour, the Duke and Duchess of Cambridge couldn't help but turn heads when they stepped out for a royal engagement on October 23.

It was one of the Queen Mother's favourite pieces, with the royal photographed wearing it on numerous occasions.

Take a look through her impressive collection below.

Meghan wore a Blue "Gingko" Cape Dress by British label Safiyaa, while Kate wore a pale blue dress by Alexander McQueen.

Princess Diana and Kate Middleton pictured wearing the Cambridge Lover's Knot tiara. Online, the tiara is more than 100 years old and belongs to Queen Elizabeth, although it was originally commissioned in 1914 for the queen's grandmother, Queen Mary.

In her will Queen Mary left the tiara to to the Queen who wore it frequently, including at an evening event in 1955.

The state banquet for the Dutch royals, the first for Willem-Alexander and his Argentine-born wife Maxima, followed the usual pattern for royal state visits, including an elaborate ceremonial welcome and a state carriage procession to the palace. It was one of her most important marital presents, coming from her groom himself, and she wore it on their wedding day at St. George's Chapel, Windsor. Prince Charles, the Prince of Wales and Camilla, the Duchess of Cornwall were also on hand for the banquet for 150 guests.

It was also seen on Kate at last year's Diplomatic Reception.

  • Kyle Peterson