Kate Middleton dazzles in Princess Diana's tiara for glamorous evening at the palace

An evening at the palace! 

The Duke and Duchess of Cambridge joined the rest of the royal family for the Diplomatic Corps reception on Wednesday evening, which is held yearly by Queen Elizabeth for ambassadors and other dignitaries. 

While Prince William looked polished to a T in his tuxedo, it was his wife that truly stole the show in her navy velvet Alexander McQueen gown. The mom-of-three brought out all the stops for the white-tie evening, including her late mother-in-law's famous Lover's Knot tiara. Also known as Cambridge Lover's Knot tiara, the intricate headpiece was first owned by Queen Mary in the early 1900s and was gifted to Princess Diana in 1981. 

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Duchess Kate stuns at Diplomatic Reception
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Duchess Kate stuns at Diplomatic Reception
The Duchess of Cambridge talks to guests at an evening reception for members of the Diplomatic Corps at Buckingham Palace in London. PA Photo. Picture date: Wednesday December 11, 2019. See PA story ROYAL Queen. Photo credit should read: Victoria Jones/PA Wire
The Duchess of Cambridge at an evening reception for members of the Diplomatic Corps at Buckingham Palace in London. PA Photo. Picture date: Wednesday December 11, 2019. See PA story ROYAL Queen. Photo credit should read: Victoria Jones/PA Wire
The Duchess of Cambridge talks to guests at an evening reception for members of the Diplomatic Corps at Buckingham Palace in London. PA Photo. Picture date: Wednesday December 11, 2019. See PA story ROYAL Queen. Photo credit should read: Victoria Jones/PA Wire
The Duchess of Cambridge talks to guests at an evening reception for members of the Diplomatic Corps at Buckingham Palace in London. PA Photo. Picture date: Wednesday December 11, 2019. See PA story ROYAL Queen. Photo credit should read: Victoria Jones/PA Wire
The Duchess of Cambridge talks to guests at an evening reception for members of the Diplomatic Corps at Buckingham Palace in London. PA Photo. Picture date: Wednesday December 11, 2019. See PA story ROYAL Queen. Photo credit should read: Victoria Jones/PA Wire
The Duchess of Cambridge talks to guests at an evening reception for members of the Diplomatic Corps at Buckingham Palace in London. PA Photo. Picture date: Wednesday December 11, 2019. See PA story ROYAL Queen. Photo credit should read: Victoria Jones/PA Wire
The Duchess of Cambridge talks to guests at an evening reception for members of the Diplomatic Corps at Buckingham Palace in London. PA Photo. Picture date: Wednesday December 11, 2019. See PA story ROYAL Queen. Photo credit should read: Victoria Jones/PA Wire
The Duchess of Cambridge, the Duke of Cambridge, and the Duchess of Cornwall at an evening reception for members of the Diplomatic Corps at Buckingham Palace in London. PA Photo. Picture date: Wednesday December 11, 2019. See PA story ROYAL Queen. Photo credit should read: Victoria Jones/PA Wire
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The duchess paired the spectacular headpiece with diamond earrings and the Nizam of Hyderabad necklace, which was designed by Cartier and gifted to the queen for her wedding. 

Kate's long-list of accessories doesn't end there, however. The duchess also sported a blue sash, signifying her appointment as Dame Grand Cross of the Royal Victorian Order (GCVO), an honor she received from Her Majesty in April. Kate joins the Duchess of Cornwall and the Countess of Wessex in the elite honor, which celebrates their dedication to the crown. 

The duchess first debuted the sash this past June at a state banquet to honor President Trump. She once again wore her go-to Alexander McQueen for the evening, as well as the Lover's Knot tiara, which has become a favorite for the royal.

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Kate Middleton at the state banquet
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Kate Middleton at the state banquet
LONDON, UNITED KINGDOM - JUNE 03: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 24 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge departs Kensington Palace to attend a State Banquet at Buckingham Palace on day 1 of US President Donald Trump's State Visit to the UK on June 3, 2019 in London, England. President Trump's three-day state visit will include lunch with the Queen, and a State Banquet at Buckingham Palace, as well as business meetings with the Prime Minister and the Duke of York, before travelling to Portsmouth to mark the 75th anniversary of the D-Day landings. (Photo by Max Mumby/Indigo/Getty Images)
LONDON, UNITED KINGDOM - JUNE 03: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 24 HOURS AFTER CREATE DATE AND TIME) Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge depart Kensington Palace to attend a State Banquet at Buckingham Palace on day 1 of US President Donald Trump's State Visit to the UK on June 3, 2019 in London, England. President Trump's three-day state visit will include lunch with the Queen, and a State Banquet at Buckingham Palace, as well as business meetings with the Prime Minister and the Duke of York, before travelling to Portsmouth to mark the 75th anniversary of the D-Day landings. (Photo by Max Mumby/Indigo/Getty Images)
The Duchess of Cambridge and United States Secretary of the Treasury, Steven Mnuchin arrive through the East Gallery during the State Banquet at Buckingham Palace, London, on day one of the US President's three day state visit to the UK.
The Duchess of Cambridge and United States Secretary of the Treasury, Steven Mnuchin arrive through the East Gallery during the State Banquet at Buckingham Palace, London, on day one of the US President's three day state visit to the UK.
The Duchess of Cambridge and United States Secretary of the Treasury, Steven Mnuchin arrive through the East Gallery during the State Banquet at Buckingham Palace, London, on day one of the US President's three day state visit to the UK.
Prime Minister Theresa May and the Duke of Cambridge, followed by the Duchess of Cambridge and United States Secretary of the Treasury, Steven Mnuchin, as they arrive through the East Gallery during the State Banquet at Buckingham Palace, London, on day one of the US President's three day state visit to the UK.
The Duchess of Cambridge and United States Secretary of the Treasury, Steven Mnuchin arrive through the East Gallery during the State Banquet at Buckingham Palace, London, on day one of the US President's three day state visit to the UK.
The Duchess of Cambridge and United States Secretary of the Treasury, Steven Mnuchin arrive through the East Gallery during the State Banquet at Buckingham Palace, London, on day one of the US President's three day state visit to the UK.
Prime Minister Theresa May and the Duke of Cambridge, followed by the Duchess of Cambridge and United States Secretary of the Treasury, Steven Mnuchin, as they arrive through the East Gallery during the State Banquet at Buckingham Palace, London, on day one of the US President's three day state visit to the UK.
The Duchess of Cambridge and United States Secretary of the Treasury, Steven Mnuchin arrive through the East Gallery during the State Banquet at Buckingham Palace, London, on day one of the US President's three day state visit to the UK.
Britain's Catherine, Duchess of Cambridge (L) walks with US Secretary of Treasury Steven Mnuchin as they arrive through the East Gallery during a State Banquet in the ballroom at Buckingham Palace in central London on June 3, 2019, on the first day of the US president and First Lady's three-day State Visit to the UK. - Britain rolled out the red carpet for US President Donald Trump on June 3 as he arrived in Britain for a state visit already overshadowed by his outspoken remarks on Brexit. (Photo by Victoria Jones / POOL / AFP) (Photo credit should read VICTORIA JONES/AFP/Getty Images)
LONDON, ENGLAND - JUNE 03: Catherine,Duchess of Cambridge and United States Secretary of the Treasury, Steven Mnuchin arrive through the East Gallery for a State Banquet at Buckingham Palace on June 3, 2019 in London, England. President Trump's three-day state visit will include lunch with the Queen, and a State Banquet at Buckingham Palace, as well as business meetings with the Prime Minister and the Duke of York, before travelling to Portsmouth to mark the 75th anniversary of the D-Day landings. (Photo by Victoria Jones- WPA Pool/Getty Images)
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