The Oscar de la Renta dress that Meghan wore to Princess Diana's niece's wedding

Prince Harry and Meghan Markle attended the wedding of Celia McCorquodale and George Woodhouse, and the Duchess of Sussex stunned with her gorgeous fashion statement.

Attended by several members of the Spencer Family, the ceremony took place on June 16, 2018, at St. Andrew and St. Mary's Church in Stoke Rochford, Lincolnshire.

And Markle truly stood out with her elegant choice of outfit, as revealed by several photographs shared on Twitter.

She wore a shirt dress, which was designed by Oscar de la Renta. She complemented the dress with a white mirrored clutch and white pointed-toe stilettos.

Celia is the daughter of Lady Sarah McCorquodale, Princess Diana's elder sister, and she turned up at the event wearing the same tiara that her late aunt wore during her wedding to Prince Charles in 1981

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The iconic silver tiara sports a large gold foliage decorated with tulips as well as stars and a big heart in the middle. They are all adorned with diamonds. The tiara is in unique curved shape, which makes it a bit different from a majority of other royal headpieces.

Among the guests were Earl Spencer and Lady Jane Fellowes, Diana's siblings, and Lady Kitty Spencer, who is also a model for Dolce & Gabbana.

The Duke and Duchess of Cambridge - Prince William and Kate Middleton - were among the absentees and were nowhere to be found during the wedding.

In the ceremony, Celia arrived at the church in a 1910 Rolls Royce Silver Ghost alongside her father, Neil McCorquodale. She had a bouquet of gorgeous white flowers clutched in her hand. The event lasted for about 45 minutes and the celebrations later continued at Celia's parents' home.

The Duchess of Sussex made quite a fashion statement during the ceremony, which is quite commendable given the number of royal rules and policies that restrict her fashion alternatives.

According to Elle, Markle has to follow even more royal rules than Princess Beatrice and Princess Eugenie when it comes to fashion.

One of the most noticeable restrictions placed upon her is shutting down of all her official social media accounts after getting engaged to Prince Harry. This includes her Instagram account and her lifestyle blog, The Tig.

Another important restriction that Markle needs to consider is the length of the dress. Markle has so far stuck to dresses that are at least knee-length at all official royal events.