Kate Middleton news: Duchess in Princess Diana’s diamond tiara at Buckingham Palace event

Kate Middleton and Prince William, both 36, were all smiles as they travelled to Buckingham Palace in London this evening.

The Duke and Duchess of Cambridge sat beside one another in the backseat, as they left Kensington Palace in order to make their way to an evening reception for members of the Diplomatic Corps.

The mother-of-three was the epitome of elegance as she stepped out in the stunning Cambridge Lovers’ Knot Tiara.

Her tiara was previously owned by the Duke of Cambridge’s late mother, Princess Diana.

It’s believed to be the fourth time that the royal has worn the stunning headpiece.

The item was created for Queen Mary back in 1914, by E. Wollf & co for Garrad.

In 1981, Queen Elizabeth II, 92, gave the tiara to Princess Diana, as a wedding gift for her marriage to Prince Charles.

The stunning jewellery features 19 diamond arches, which have 19 baroque pearl pendants.

Tonight, Kate styled her hair in a stunning up do, and teamed her bejewelled look with a pair of sparkling drop earrings – thought to be Princess Diana’s Collingwood pearl earrings.

She also opted for glitz with her fashion choices – stepping out in a pale-toned ensemble which had been adorned with jewels. It is thought to be a custom design by Jenny Packham.

She donned a vibrant red tartan skirt, which was cut to just below her knees.

Kate teamed with a pair of black boots, as well as a black top which had a number of buttons down the centre.

Meanwhile, Prince William cut a casual figure in an all-blue get-up.

He wore a pale shirt, trousers, and a zip neck sweatshirt.

Elsewhere this evening, fellow royals Prince Harry, 34, and Meghan Markle, 37, were seen stepping out in London tonight.