Although Markle has put the brand on the map recently, this isn't the first time a royal has chosen to wear the feminine label.
The Duke and Duchess of Cambridge arrive at Buckingham Palace.
Prince Harry and Meghan Markle arrive at the Royal Christmas lunch at Buckingham Palace, London, Dec. 20, 2017.
The "Nightshade Midi Dress", with a black lace top with pink and white details and a solid black skirt, sold out after Meghan was seen in it.
It seems as though Meghan Markle is already a beloved member of the royal family. And now, she's celebrating the holidays with her fiancé's extended family.
The look uses a combination of waxing, tweezing and threading to create a "modern, elegant and super flattering" style, flawless for a wedding.
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Princess Eugenie was also spotted being driven into the Palace in a bright red dress, while Beatrice was wearing a dark overcoat. While this design would be bolder than looks sported on previous royals' wedding days, the dress demonstrates her more modern approach to the aristocracy.
Members of the extended family were also among the early arrivals with Autumn Phillips, the wife of Peter Phillips seen at the wheel of the vehicle.
Eagle eyed royal fans may have been able to spot her daughter Isla Phillips, who appeared to be in an excitable mood ahead of Christmas.
And sister-in-law to be Kate is said to be hoping to give Meghan a "magical and memorable" first Christmas with her new family.
She's recently moved full-time to the United Kingdom, as the couple prepare for their wedding next May.
Harry and Meghan will be married on May 19 at Windsor Castle's St George's Chapel, a month after William and Kate are expecting the birth of their third child.