Kate Middleton Looked Stunning in Diana's Favorite Tiara

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All eyes were on Duchess Catherine as she floated into Buckingham Palace like a bejeweled goddess at Queen Elizabeth's state banquet. The exquisite dinner was held in honor of King Felipe VI and Queen Letizia of Spain.

The black-tie affair, which took place in the palace ballroom on Wednesday evening, saw a huge 170-guest turn out, including royal family favorites Prince Philip, Prince William, Prince Harry, Prince Charles, and Duchess Camilla.

All eyes were on Catherine, as the 35-year-old dazzled in her fashion-forward, bespoke Marchesa gown. The dusky pink dress had a deep v-neck, and the sweeping neckline was ideal for her show-stopping ruby and diamond floral bandeau necklace—which she borrowed from Prince William's royal grandmother.

See even more of Kate's dazzling looks!

Prince George and Princess Charlotte's mom opted for her trusted smoky eye and rose-hued makeup combo.

Her floor length ensemble was completed with her hair pulled back into a bun, adorned with the Cambridge lover’s knot tiara, one of Princess Diana's favorites!

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Meanwhile, Catherine's Spanish counterpart, Queen Letizia, took a note out of Kate's 2016 state dinner look, donning a vibrant off-the-shoulder red dress embellished with intricate beadwork. The 44-year-old completed her whimsical look with her stunning crown and a pair of diamond earrings.

Her Majesty continued her reign as the Queen of great looks, donning an aquamarine tiara and a white satin Angela Kelly dress with sparkling embellishments. The 91-year-old proudly led the royal procession into a banquet hall, with King Felipe by her side.

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According to U.K.'s Daily Express, guests dined on dishes such as poached fillet of salmon trout with fennel in a white wine veloute sauce, Scottish beef medallions with bone marrow and truffles, runner beans with sautéed radishes, celeriac salad, fondant potatoes, yellow and green zucchini, summer squash, and dark chocolate and raspberry tarts.

"Your majesty, the Duke of Edinburgh and I are delighted to welcome you and Queen Letizia to Buckingham Palace this evening," the Queen said in her welcoming speech.

"This state visit is an expression of the deep respect and friendship that describes relations between Spain and the United Kingdom," she continued. "Just occasionally, a state visit can provide great opportunity for great personal happiness also."

"So it was more than a century ago when your great-grandfather, King Alfonzo the 13th, met his future wife, Princess Victoria Eugenie, the granddaughter of our Queen Victoria, in this very ballroom," the Queen noted.

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The head of state reflected on Felipe's parents' visit back in 1986, before adding, "We remain deeply committed to the common defense and freedom of our countries."

The Spanish royals are currently on a three-day state visit to the U.K.

Earlier that day, they enjoyed afternoon tea with Charles and his wife, Camilla.

Snaps from the afternoon showed royal fans an inside look into the future king's home. The 69-year-old had a few family portraits on display, including a snap of his grandson Prince George. The photo of the then three-month-old was taken at George's christening, featuring the family in the line of succession: the Queen, Prince Charles, Prince William, and Prince George.

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What a splendid royal gathering! We're still starry-eyed by Kate's jewels and the rest of the brilliant wears that were on display.

This post was written by Chloe Lal. For more, check out our sister site Now To Love.

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