Kate Middleton stuns in a color-block dress for Queen Elizabeth's outdoor birthday party

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When the Queen celebrates a birthday, one must celebrate in style!

That's exactly what Kate Middleton did on Sunday, when Queen Elizabeth II, who turned 90 on April 21, was honored with an outdoor party on The Mall in London, England. The Duchess of Cambridge brightened the rainy day by stepping out in a color-block dress for The Patron's Lunch.

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The fabulous frock was designed by Roksanda Ilincic and featured powder blue and coral hues. (Similar here.) Middleton completed her classy look with a pair of nude stilettos and a matching clutch.

The 34-year-old royal was all smiles as she greeted the tens of thousands of guests who were in attendance of the lunch, which included a parade around St. James' Park.

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Middleton was joined by her husband, Prince William, and her brother-in-law, Prince Harry. Naturally, the regal trio arrived in style in an open-top car.

The procession also included appearances by the Earl and Countess of Wessex and their daughter, Lady Louise, as well as Prince Andrew and his daughters, Princesses Beatrice and Eugenie.

The fête was part of a weekend of celebrations honoring the Queen's milestone birthday, her 63-year reign and patronage of more than 600 charities and organizations. The Royal Family kicked off the festivities with the Service of Thanksgiving at St. Paul's Cathedral on Friday, where Middleton rocked an ensemble in a similar light blue hue.

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The Queen opted for a chic yellow suit, complete with a matching hat and white gloves.

One day later, Britain's longest-reigning monarch was honored at the Trooping the Colour parade, where 1-year-old Princess Charlotte made her first official public appearance on the same Kensington Palace balcony that her big brother, Prince George, did just one year earlier at the same event.

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All eyes were on little Charlotte, who donned a baby pink dress with matching shoes and socks. Her look perfectly complemented her stylish mother's ensemble, which consisted of a pale pink hat and white coat dress. Charlotte's 2-year-old brother wore a blue collared shirt, while the Duke of Cambridge sported his Irish Guards tunic.

Looking stunning as always, the Queen turned heads in a vibrant green coat and dress by Stewart Parvin for the three-hour event.

WATCH: Princess Charlotte Makes Her First Public Appearance at Trooping the Colour Parade

Queen Elizabeth Celebrates 90th Birthday, Princess Charlotte Makes First Public Appearance


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