The Duchess of Cambridge continued a royal style tradition last night by wearing a pearl choker which belongs to Queen Elizabeth II to commemorate her Majesty and Prince Philip's 70th wedding anniversary at Windsor Castle.

The 35-year-old royal - who is expecting her third child with Prince William - was pictured arriving at the dinner party in a black limousine next to husband William, and brother-in-law Prince Harry.

The regal four-strand pearl choker with a central diamond clasp was worn by the monarch in the 1980s and 1990s, and was commissioned using a collection of cultured pearls given to the Queen by the Japanese government (via Hello!).

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The statement piece has previously been worn by Princess Diana at a banquet in the Netherlands back in 1982.

Kate teamed the striking pearl choker with a pair of Collingwood pearl and diamond earrings which had been a wedding present to the late Diana, and which Kate had previously worn in July during the state banquet for the visiting Spanish royals.

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Princess Diana Archive/Hulton Archive//Getty Images

The royal looked understated in a black Diane von Furstenberg Zarita lace gown which she recently wore at a Kensington Palace gala, and before that while pregnant with Princess Charlotte in 2014.

Prince Harry's girlfriend Meghan Markle also donned a shorter version of same DVF dress while attending a red carpet event back in 2012.

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The Queen and Prince Philip celebrated their platinum wedding anniversary with their four children - Prince Charles, Princess Anne, Prince Edward and Prince Andrew.

Other guests were reported to include Princesses Eugenie and Beatrice, the Duke of Kent and ex-King Constantine of Greece.

Markle, although reportedly in London with Harry after recently wrapping Suits, was not in attendance.