\"Any designer[s] that are doing the dress on the big day will have to have signed a strict non-disclosure agreement,\" Scobie said. \"And with Ralph & Russo, they've actually had to move their external PR company in-house.\"

\"PHOTO:
Richard Bord/Getty Images
PHOTO: Designer Michael Russo and Tamara Ralph acknowledge the audience during the Ralph & Russo Spring Summer 2017 show at the Grand Palais as part of Paris Fashion Week, Jan. 23, 2017 in Paris.
>

He continued, \"And that may be one of the biggest clues we've had that they could be one of the dress designers on the big day.\"

Canadian designer Erdem Moralioglu has also emerged to be a top contender.

\"PHOTO:
Mike Marsland/Getty Images
PHOTO: Erdem Moralioglu poses in the winners room with the British Designer of the Year award at the Elle Style Awards 2017, Feb. 13, 2017 in London.
>

Moralioglu is from Canada, where Markle stayed while filming “Suits,” but established his fashion line, ERDEM, in London in 2005.

Designer Roland Mouret, a close friend of Markle's, is among the designers still being discussed by royal watchers to dress Markle in some capacity, or dress her wedding party.

\"PHOTO:
George Pimentel/WireImage via Getty Images, FILE
PHOTO: Designer Roland Mouret and actress Meghan Markle attend the Roland Mouret private dinner at Corkin Gallery in this April 28, 2016 file photo in Toronto.
>

He is now considered by royal watchers to be a more viable choice to design Markle's dress for the intimate, private evening reception at Frogmore House hosted by Prince Charles.

Most insiders think it unlikely Markle will give the nod to a French designer and instead select a British or American designer, or a designer from a Commonwealth country like Canada or Australia.

British designer Victoria Beckham, whose sweater Markle wore in her engagement photos with Harry, recently denied she is creating Markle's dress.

Prince Harry and Ms. Meghan Markle have chosen to release this official portrait photograph to mark their engagement. The photograph was taken by photographer @alexilubomirski earlier this week at Frogmore House, Windsor.

A post shared by Kensington Palace (@kensingtonroyal) on Dec 21, 2017 at 3:59am PST

“Sadly, I'm not,\" Beckham said on \"The Late Late Show With James Corden.\" \"But I am sure she will look incredible.”

When Princess Kate wed Prince William in 2011, Sarah Burton, the creative director at McQueen, was asked if she had the commission and denied her involvement.

It was only on Kate's wedding day that Burton finally revealed she was the visionary behind Kate's iconic gown.

As her wedding day approaches, Markle is following a bridal boot camp regime to get ready for her May 19 wedding at Windsor Castle, \"GMA\" has learned.

\"PHOTO:
Chris Jackson/Getty Images
PHOTO: Meghan Markle attends a reception with delegates from the Commonwealth Youth Forum during the Commonwealth Heads of Government Meeting at the Queen Elizabeth II Conference Center, April 18, 2018, in London.
>

Markle, who has said previously that she is a fan of Megaformer pilates, is now focused on cardio work and training with one of Harry's personal trainers at Kensington Palace, according to Scobie.

\"Meghan was also recently seen visiting a yoga instructor somewhere here in London, and that will be a big part of her big, bridal body workout,\" he added.

\"PHOTO:
Samir Hussein/WireImage/Getty Images
PHOTO: Prince Harry and Meghan Markle visit Catalyst Inc, a next generation science park, to meet young entrepreneurs and innovators, March 23, 2018, in Belfast, Northern Ireland.
>

\"GMA\" has also learned Markle, a California native, is working with her close friend and style adviser, Jessica Mulroney, to plan an American twist to her wedding celebrations.

\"Meghan is actually planning an American-style rehearsal dinner with her nearest and dearest here in London,\" he said. \"That will take place probably without members of the royal family.\"

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