Princess Charlene’s back-up wedding dress that’s never been pictured

The royal couple’s three-day wedding festivities saw high-profile guests including, his wife, and the likes of gather at the Prince’s Palace of Monaco as well as the Sainte Devote church.

Both of Charlene’s stunning bridal gowns, as well as her famously unconventional blue suit for her pre-wedding concert, have been widely documented, but there was another dress that only the bride and the designer have laid eyes on.

Like many royals, Charlene had a backup dress in case of any emergencies, Giorgio Armani’s niece Roberta confessed. After helping the bride prepare for her big day at the Hermitage Hotel, Roberta reflected on the “huge responsibility” of creating the . “It was such a huge responsibility that we actually made two dresses just in case something happened to one of them,” Roberta said.

Since the finished design featured a five-meter-long train adorned with 40,000 Swarovski crystals and 20,000 mother-of-pearl teardrops – the work of took three seamstresses over 2,500 hours – we can likely expect the second unseen dress to be equally as intricate in case it was ever needed to be used.

Gushing about how the design complemented the former Olympic swimmer’s athletic figure, Roberta added: “My uncle wanted to make sure the dress was timeless and sophisticated. Charlene is blessed with an amazing body and spectacular shoulders, which is a fantastic base for any dress. The shade of ivory we chose suits her skin so well.”

Charlene later changed into a featuring rows of sequins alongside a bejewelled Alice hairband for the evening reception.

The 46-year-old mother-of-two was not the only royal lady who had more than one bridal gown made to provide for all possible contingencies. Princess Diana’s wedding dress maker Elizabeth Emanuel of the “spare” gown she created alongside her ex David, which, aside from a few details, was different from the one the royal bride wore.

Diana made history as she walked down the aisle at St Paul’s Cathedral on 29 July 1981 in a magnificent puff-sleeve wedding dress hand-embellished with 10,000 mother-of-pearl sequins and pearls and an incredible 25-foot train.

“The spare wedding gown was made just in case the secret of the real dress ever got out. Fortunately, it was never used,” Elizabeth began.

“The dress was made in pale ivory silk taffeta with embroidered scalloped details on the hem and sleeves. Tiny pearls were sewn on the bodice.”

It has never been pictured, but Elizabeth released sketches of the gown, which included a V-neck with a more understated ruffle trim, three-quarter sleeves and a wide princess skirt. “People always ask you what it was like. It was similar in certain respects and both had the big skirt, but everything else was different.

“So it was really just a back-up to the original and I don’t know where it went. It just disappeared,” the 70-year-old designer said.