Duchess of Cambridge wears Princess Diana's tiara for rare royal family photo inside Buckingham Palace

Posing for a picture that was posted on Instagram, the Duke and Duchess of Cambridge can be seen standing alongside the rest of the royal family including the Queen and Prince Philip along with Prince Charles and the Duchess of Cornwall.

Kate recycled a red Jenny Packham gown first seen on her in 2015 [Photo: PA]

Draped in diamonds, the Duchess of Cambridge made a rare outing in a tiara tonight for the annual Diplomatic Reception at Buckingham Palace.

Designed by her go-to occasion designer, Jenny Packham, the glittering dress was first worn at a state banquet for the Chinese President in October 2015. In fact, the dress was specifically designed in a royal red shade to celebrate China.

The Duchess also donned the Cambridge Lover’s Knot tiara: a design made of diamond and pearls that was much loved by William’s mother, Diana. It is said to be so heavy that it gave her headaches but Kate appeared to be all smiles.

This is only the fifth time the Duchess has worn a royal tiara; the first being at her wedding in 2011. The Cambridge Lover’s design was made in 1914 for Queen Mary who then left it to the Queen. In 1981, the monarch gave the tiara to Diana as a wedding present who wore it on several occasions.

Going back to the rest of the royal family’s reception outfits: Camilla wore a white beaded dress by Bruce Oldfield along with a stand-out pearl choker. The Queen, meanwhile, opted for a bespoke design by her senior dresser and personal assistant, Angela Kelly, as well as a sapphire and diamond tiara from her collection.