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Catherine Duchess of Cambridge, Kate Middleton

Tim Rooke/REX Shutterstock

Here's your princess.

Kate Middleton's style has always been one to admire, but tonight called for something special, and with that comes a whole new level respect and appreciation. The Duchess of Cambridge turned up her royal wardrobe by wearing a tiara to the annual Diplomatic Reception at Buckingham Palace tonight with Prince William, the fourth time we've ever seen her wear the regal piece.

But it's not just any tiara. It's the Lover's Knot tiara, which belonged to the late Princess Diana, and was gifted to Wills' mother from Queen Elizabeth II on her wedding day in 1981 to Prince CharlesThis is the first time anyone has worn the piece since Diana's tragic death in 1997.

The tiara was reportedly commissioned from Garrard in 1913-1914 by Queen Mary. She was inspired by a crown owned by her grandmother, Princess Augusta of Hesse, the Duchess of Cambridge.

After Mary died in 1953, the tiara was passed to Queen Elizabeth II, who wore it regularly until she decided to focus on some of her other jeweled accessories, and ultimately gifted the tiara to her daughter-in-law, which ended up being on of the Princess of Wales' favorite pieces.

The tiara contains swinging pearls hanging from 19 diamond arches capped with lover's knots, some of which were composed by Queen Mary's jewels from her collection.

There's no doubt it's a thing of beauty, and it looks absolutely gorgeous on Kate.