The Duchess of Cambridge rocked a diamond and pearl tiara at an event honouring Britain’s diplomatic community.
Stepping out at Buckingham Palace, this is the second time Kate has worn this particular tiara – she worse it to the same event last year.
The tiara itself was famously gifted to the late Princess Diana as a wedding present from the Queen in 1981.
Apparently the tiara is over 100 years old – commissioned by Queen Mary in the early 1900s.
Lady Di was particularly fond of this headpiece – known as the Cambridge Lover's Knot - and brought it out on numerous occasions – including during a trip to New Zealand in 1983.
This is only the fifth time Kate has worn a tiara, despite having been married into the Royal Family for more than five years.
The first was on her wedding day in 2011.
The Duchess paired the jeweled headpiece with diamond earrings and a stunning red Jenny Packham gown.
Camilla was also there with a tiara crowning her head, posing with Prince Charles, The Queen, Prince Philip and William of course.
The Queen took pride of place at the centre, wearing a white gown and a blue ceremonial sash.
The Duke of Edinburgh, the Prince of Wales and the Duke of Cambridge all donned the Order of the Garter with the Garter sash and knee breeches for the event.