Princess Eugenie's reception dress: Her Zac Posen wedding reception gown is even more magnificent in this behind the scenes picture

Megan C. Hills

Princess Eugenie turned 29 at the weekend, taking to Instagram to thank her well wishers and writing that her “28th year was the best one yet”.

One person who congratulated Eugenie at the weekend was designer Zac Posen, who posted a never before seen image of Eugenie in the wedding reception dress he designed for her.

Posen took to Instagram to wish Princess Eugenie a happy birthday, sharing an image of the gown as he knelt on the ground before her to adjust its long train.

After working closely with Eugenie on her wedding reception dress, Posen wrote, “Every now and then you meet somebody who just knocks your socks off. This last year I got to know a young lady who possessed natural elegance, a heart of gold and sophisticated humor.”

“My studio and I had the honor (and the best time) collaborating with her on her special gown...Happy Birthday! @princesseugenie,” he finished.

Posen also used the image as an opportunity to help support Princess Eugenie's charity The Anti Slavery Collective, an organisation which battles modern slavery. He said, “Best of all she is dedicated to using her privilege to help our world and its people with her project @the_anti_slavery_collective.”

The royals’ official website revealed that the dress designed by Posen was “inspired by the beauty of Windsor and the surrounding countryside” with the “choice of colour [reflecting] the blush of an English rose”.

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They added that the design stemmed from the White Rose of York, which is evident in the elaborate pleating on the bodice of the gown and subtle rose embroidery on its shoulders which holds the trailing cape together.

Posen has revealed multiple images of the dress in progress on his personal Instagram, showing just how much time and effort went into creating the piece.

From his original draping of the gown on a mannequin to close up details of the rose embroidery, the details were exquisite.

In fact, you can actually see Princess Eugenie’s wedding reception dress in person as it’s currently on show at Windsor Castle.

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Posen said on Instagram that the exhibit was “a real pinch me moment” and added, “Thank you @princesseugenie and You’re [sic] wonderful family, I will cherish this experience and our friendship forever!”

You can learn more about Princess Eugenie’s charity The Anti Slavery Collective here.