The Duchess of Cambridge paid a touching tribute to her late mother-in-law on Tuesday night (and gave us all some serious princess style goals in the process).
Kate Middleton attended the Queen's annual Diplomatic Reception, on 8 December, wearing a dazzling diamond and pearl tiara once owned by Princess Diana.
The Duchess of Cambridge arrives at Buckingham Palace for the annual Diplomatic Reception on 8 December 2015
She paired the stunning Cambridge Lover's Knot tiara with one of her favourite Alexander McQueen dresses - the same lacy, ice blue gown she wore to the 2013 event.
According to the Daily Mail, the tiara was originally made by Queen Mary in 1914 and has been passed down through royal generations before it was given as a wedding present to Diana by the Queen.
Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend the annual Diplomatic Reception on 8 December 2015
This isn't the first time Kate has chosen to pay tribute to Diana by wearing her gorgeous jewellery.
Prince William famously proposed to her with his mother's engagement ring and also have her Diana's earrings as a present.
Princess Diana wore the Garrard-designed tiara many times, pictures here in 1983
See more of Kate's most stylish looks in our gallery below:
Kate Middleton's Most Stylish Looks
The Duchess Of Cambridge Is Taking More Fashion Risks And It's Paying Off
Here's Where To Buy The Duchess Of Cambridge's Space Print Dress
Caitlyn Jenner Wears Kate Middleton's Engagement Dress