Royal style icons collided at Buckingham Palace on Wednesday (July 12) evening. Queen Letizia and the Duchess of Cambridge were dripping in jewels at the state banquet held in honor of the Spanish monarch and her husband King Felipe’s state visit to the United Kingdom.

The Duchess of Cambridge looked regal wearing Princess Diana's favorite tiara and a necklace borrowed from Queen Elizabeth

Kate Middleton stunned for the occasion donning a lace pink gown by Marchesa that features trumpet sleeves and a daring neckline. The blush-colored gown appears to be an altered version of the designers' pre-fall 2017 "Tulle-paneled guipure lace peplum gown" that retails for $4,265. Prince William’s wife completed her regal look wearing Princess Diana’s favorite Cambridge Lover's Knot tiara — marking the third time she’s worn the dazzling headpiece.

A state banquet was held in honor of Letizia and Felipe's state visit Photo: Dominic Lipinski - WPA Pool/Getty Images

The 35-year-old added even more sparkle to her outfit wearing her late mother-in-law’s Collingwood Pearl and Diamond Earrings, which paired nicely her show-stopping Ruby and Diamond Floral Bandeau Necklace, which was a wedding gift to Queen Elizabeth from her parents, King George VI and Queen Elizabeth. Prince George’s mom styled her glossy tresses up into an elegant updo to highlight the dazzling piece.

Queen Letizia stunned in red at the state banquet dinner held at Buckingham Palace Photo: MATT DUNHAM/AFP/Getty Images

GALLERY: HIGHLIGHTS FROM LETIZIA AND FELIPE'S UK STATE VISIT

Letizia, 44, also made a statement at the formal dinner stepping out in a striking red, off-the-shoulder embellished gown by her go-to designer Felipe Varela, which she paired with the Fleur-de-Lis tiara. Felipe's stylish wife has only worn the tiara once (February 2017) before. The Spanish royal made her way to the palace’s ballroom accompanied by Prince Philip. Meanwhile her husband escorted Queen Elizabeth to the state banquet. Princes William and Harry were also in attendance for the royal affair. While the ginger-haired royal’s girlfriend Meghan Markle is across the pond in Toronto, he was joined by Rose Hanbury, the Marchioness of Cholmondeley.

Her majesty sat beside King felipe at the formal dinner Photo: Dominic Lipinski - WPA Pool/Getty Images

During the dinner, Queen Elizabeth delivered a speech welcoming her foreign guests. "The relationship between our two nations is dynamic and modern," the British monarch said. "A relationship like ours, founded on such great strengths and common interests, will ensure that both our nations prosper, now and in the future, whatever challenges arise. With such a remarkable shared history, it is inevitable that there are matters on which we have not always seen eye to eye. But the strength of our friendship has bred a resilient spirit of cooperation and goodwill."

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