It isn鈥檛 often that we get to see Kate Middleton dressed like an actual princess, but for a state dinner last night with Spanish royalty, The Duchess of Cambridge pulled out all the stops. To welcome King Felipe VI and Queen Letizia to the UK, the 35-year-old wore an actual tiara, and a showstopping necklace on loan from the Queen. But the best part is that the tiara was actually a fave of the late Princess Diana!

It鈥檚 not the first time Middleton has donned the tiara 鈥 she wore the crown recently at December鈥檚 diplomatic reception. Prince William鈥檚 mother was gifted the Lover鈥檚 Knot crown as a wedding gift from the Queen back in 1981.

According to The Mirror, the piece dates back even further still, having been created in 1914 for Queen Mary by the Royal jewelers Garrard and have been passed down through the years 鈥 yowza!

In addition to the majestic accessory, the Duchess wore a lacy, light pink Marchesa gown with three-quarter length sleeves. It was a lower neckline than we鈥檙e used to seeing on the Royal, but the sleeves featured a feminine ruffle detail that was pure Kate.

Her tiara wasn鈥檛 her only statement piece, either, with Queen Elizabeth鈥檚 own King George IV and Queen Elizabeth Bandeau necklace on full display, a jaw-dropping diamond and ruby collar with a diamond drop pendant as its centerpiece. She also chose the Collingwood pearl-drop and diamond earrings from Princess Diana鈥檚 former collection in yet another nod to her husband鈥檚 late matriarch.

The end result was impossibly glamorous, yet not over the top: Long live the tiara!

What do you think of Kate Middleton鈥檚 state dinner look? Let us know if it鈥檚 one of your faves @BritandCo!

(h/t Cosmopolitan; photos via Anwar Hussein, Neil Hall + Max Mumby/Getty)