Meghan Markle has chosen a wedding dress designer -- Inside the secret fitting!

Meghan Markle has said "yes" to a top secret dress designer!

In preparation for her upcoming royal wedding with Prince Harry this May, ET has learned that the 36-year-old actress has selected a designer with expert help from her close friend and stylist, Jessica Mulroney.

A source tells ET that Markle has even had her first fitting already! It took place at Kensington Palace last weekend, when Mulroney, who is originally from Toronto, was in town to help her pal with wedding planning.

So, what type of vibe is the former Suits star going for on her special day? According to the source, don't expect anything too over the top.

RELATED: See more of the couple

34 PHOTOS
Prince Harry and Meghan Markle in 2017
See Gallery
Prince Harry and Meghan Markle in 2017
US actress and fiancee of Britain's Prince Harry Meghan Markle (L) and Britain's Prince Harry (R) stand together as they wait to see off Britain's Queen Elizabeth II after attending the Royal Family's traditional Christmas Day church service at St Mary Magdalene Church in Sandringham, Norfolk, eastern England, on December 25, 2017. / AFP PHOTO / Adrian DENNIS (Photo credit should read ADRIAN DENNIS/AFP/Getty Images)
The Duke and Duchess of Cambridge, Meghan Markle and Prince Harry leave the Christmas Day morning church service at St Mary Magdalene Church in Sandringham, Norfolk. (Photo by Joe Giddens/PA Images via Getty Images)
KING'S LYNN, ENGLAND - DECEMBER 25: Prince Charles; Prince of Wales Catherine, Duchess of Cambridge, Meghan Markle and Prince Harry attend Christmas Day Church service at Church of St Mary Magdalene on December 25, 2017 in King's Lynn, England. (Photo by Chris Jackson/Getty Images)
KING'S LYNN, ENGLAND - DECEMBER 25: (L-R) Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge, Meghan Markle and Prince Harry attend Christmas Day Church service at Church of St Mary Magdalene on December 25, 2017 in King's Lynn, England. (Photo by Chris Jackson/Getty Images)
TOPSHOT - (L-R) US actress and fiancee of Britain's Prince Harry Meghan Markle and Britain's Prince Harry arrive to attend the Royal Family's traditional Christmas Day church service at St Mary Magdalene Church in Sandringham, Norfolk, eastern England, on December 25, 2017. / AFP PHOTO / Adrian DENNIS (Photo credit should read ADRIAN DENNIS/AFP/Getty Images)
(L-R) US actress and fiancee of Britain's Prince Harry Meghan Markle and Britain's Prince Harry arrive to attend the Royal Family's traditional Christmas Day church service at St Mary Magdalene Church in Sandringham, Norfolk, eastern England, on December 25, 2017. / AFP PHOTO / Adrian DENNIS (Photo credit should read ADRIAN DENNIS/AFP/Getty Images)
Terms of release, which must be included and passed-on to anyone to whom this image is supplied: USE AFTER 31/05/2018 must be cleared by Kensington Palace. This photograph is for editorial use only. NO commercial use. NO use in calendars, books or supplements. Use on a cover, or for any other purpose, will require approval from Art Partner and the Kensington Palace Press Office. There is no charge for the supply, release or publication of this official photograph. This photograph must not be digitally enhanced, manipulated or modified and must be used substantially uncropped. Copyright in the photographs is vested in Prince Harry and Ms. Meghan Markle. Publications are asked to credit the photograph to Alexi Lubomirski. WINDSOR, UNITED KINGDOM - DECEMBER: (EDITOR'S NOTE: Image was shot in black and white. Colour version not available.) In this handout photo provided by Kensington Palace, Prince Harry and Meghan Markle pose for one of two official engagement photos at Frogmore House in December, 2017 in Windsor, United Kingdom. (Photo by Alexi Lubomirski via Getty Images)
NO SALES. Terms of release, which must be included and passed-on to anyone to whom this image is supplied: USE AFTER 31/05/2018 must be cleared by Kensington Palace. This photograph is for editorial use only. NO commercial use. NO use in calendars, books or supplements. Use on a cover, or for any other purpose, will require approval from Art Partner and the Kensington Palace Press Office. There is no charge for the supply, release or publication of this official photograph. This photograph must not be digitally enhanced, manipulated or modified and must be used substantially uncropped. Copyright in the photographs is vested in Prince Harry and Ms. Meghan Markle. Publications are asked to credit the photograph to Alexi Lubomirski. WINDSOR, UNITED KINGDOM - DECEMBER: In this handout photo provided by Kensington Palace, Prince Harry and Meghan Markle pose for one of two official engagement photos at Frogmore House in December, 2017 in Windsor, United Kingdom. (Photo by Alexi Lubomirski via Getty Images)
NO SALES. Terms of release, which must be included and passed-on to anyone to whom this image is supplied: USE AFTER 31/05/2018 must be cleared by Kensington Palace. This photograph is for editorial use only. NO commercial use. NO use in calendars, books or supplements. Use on a cover, or for any other purpose, will require approval from Art Partner and the Kensington Palace Press Office. There is no charge for the supply, release or publication of this official photograph. This photograph must not be digitally enhanced, manipulated or modified and must be used substantially uncropped. Copyright in the photographs is vested in Prince Harry and Ms. Meghan Markle. Publications are asked to credit the photograph to Alexi Lubomirski. WINDSOR, UNITED KINGDOM - DECEMBER: (EDITOR'S NOTE: Image was shot in black and white. Colour version not available.) In this handout photo provided by Kensington Palace, Prince Harry and Meghan Markle pose for one of two official engagement photos at Frogmore House in December, 2017 in Windsor, United Kingdom. (Photo by Alexi Lubomirski via Getty Images)
Prince Harry and Meghan Markle arriving for the Queen's Christmas lunch at Buckingham Palace, London. (Photo by Jonathan Brady/PA Images via Getty Images)
LONDON, ENGLAND - DECEMBER 20: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 24 HOURS AFTER CREATE DATE AND TIME) Prince Harry and Meghan Markle arrive for the Queen's Christmas lunch at Buckingham Palace on December 20, 2017 in London, England. (Photo by Karwai Tang/WireImage)
NOTTINGHAM, ENGLAND - DECEMBER 01: Prince Harry and Meghan Markle go on a walk about at Nottingham Contemporary on December 1, 2017 in Nottingham, England. Prince Harry and Meghan Markle announced their engagement on Monday 27th November 2017 and will marry at St George's Chapel, Windsor Castle in May 2018. (Photo by Samir Hussein/Samir Hussein/WireImage)
NOTTINGHAM, ENGLAND - DECEMBER 01: Prince Harry and Meghan Markle go on a walk about at Nottingham Contemporary on December 1, 2017 in Nottingham, England. Prince Harry and Meghan Markle announced their engagement on Monday 27th November 2017 and will marry at St George's Chapel, Windsor Castle in May 2018. (Photo by Samir Hussein/WireImage)
NOTTINGHAM, UNITED KINGDOM - DECEMBER 01: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 24 HOURS AFTER CREATE DATE AND TIME) Prince Harry and Meghan Markle attend a Terrence Higgins Trust World AIDS Day charity fair at Nottingham Contemporary on December 1, 2017 in Nottingham, England. Prince Harry and Meghan Markle announced their engagement on Monday 27th November 2017 and will marry at St George's Chapel, Windsor in May 2018. (Photo by Max Mumby/Indigo/Getty Images)
NOTTINGHAM, ENGLAND - DECEMBER 01: Prince Harry and fiancee Meghan Markle attend the Terrence Higgins Trust World AIDS Day charity fair at Nottingham Contemporary on December 1, 2017 in Nottingham, England. Prince Harry and Meghan Markle announced their engagement on Monday 27th November 2017 and will marry at St George's Chapel, Windsor Castle in May 2018. (Photo by Karwai Tang/WireImage)
Britain's Prince Harry and his fiancee, US actress Meghan Markle gesture during their visit to Nottingham Academy in Nottingham, central England, on December 1, 2017. Prince Harry and his American actress fiancee Meghan Markle were welcomed by hundreds of people on their first royal visit as a couple since announcing their engagement this week. / AFP PHOTO / POOL / Andy Stenning (Photo credit should read ANDY STENNING/AFP/Getty Images)
NOTTINGHAM, ENGLAND - DECEMBER 01: Prince Harry and his fiancee US actress Meghan Markle pose for a photograph with the cast and crew of a hip hop opera performed by young people involved in the Full Effect programme at the Nottingham Academy school on December 1, 2017 in Nottingham, England. Prince Harry and Meghan Markle announced their engagement on Monday 27th November 2017 and will marry at St George's Chapel, Windsor in May 2018. (Photo by Matt Dunham - WPA Pool/Getty Images)
NOTTINGHAM, ENGLAND - DECEMBER 01: Prince Harry and his fiancee US actress Meghan Markle visit the Terrence Higgins Trust World AIDS Day charity fair at Nottingham Contemporary on December 1, 2017 in Nottingham, England. Prince Harry and Meghan Markle announced their engagement on Monday 27th November 2017 and will marry at St George's Chapel, Windsor in May 2018. (Photo by Adrian Dennis - WPA Pool/Getty Images)
Britain's Prince Harry and his fiancee US actress Meghan Markle greet wellwishers on a walkabout as they arrive for an engagement at Nottingham Contemporary in Nottingham, central England, on December 1, 2017 which is hosting a Terrence Higgins Trust World AIDS Day charity fair. Prince Harry and Meghan Markle visited Nottingham in their first set of engagements together since announcing their engagement. / AFP PHOTO / Oli SCARFF (Photo credit should read OLI SCARFF/AFP/Getty Images)
LONDON, ENGLAND - NOVEMBER 27: Prince Harry and Meghan Markle attend an official photocall to announce their engagement at The Sunken Gardens at Kensington Palace on November 27, 2017 in London, England. Prince Harry and Meghan Markle have been a couple officially since November 2016 and are due to marry in Spring 2018. (Photo by Karwai Tang/WireImage)
LONDON, ENGLAND - NOVEMBER 27: Prince Harry and Meghan Markle attend an official photocall to announce their engagement at The Sunken Gardens at Kensington Palace on November 27, 2017 in London, England. Prince Harry and Meghan Markle have been a couple officially since November 2016 and are due to marry in Spring 2018. (Photo by Karwai Tang/WireImage)
LONDON, UNITED KINGDOM - NOVEMBER 27: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 24 HOURS AFTER CREATE DATE AND TIME) Prince Harry and Meghan Markle attend an official photocall to announce their engagement at The Sunken Gardens, Kensington Palace on November 27, 2017 in London, England. Prince Harry and Meghan Markle have been a couple officially since November 2016 and are due to marry in Spring 2018. (Photo by Max Mumby/Indigo/Getty Images)
LONDON, UNITED KINGDOM - NOVEMBER 27: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 24 HOURS AFTER CREATE DATE AND TIME) Prince Harry and Meghan Markle attend an official photocall to announce their engagement at The Sunken Gardens, Kensington Palace on November 27, 2017 in London, England. Prince Harry and Meghan Markle have been a couple officially since November 2016 and are due to marry in Spring 2018. (Photo by Max Mumby/Indigo/Getty Images)
LONDON, ENGLAND - NOVEMBER 27: Prince Harry and Meghan Markle during an official photocall to announce the engagement of Prince Harry and actress Meghan Markle at The Sunken Gardens at Kensington Palace on November 27, 2017 in London, England. Prince Harry and Meghan Markle have been a couple officially since November 2016 and are due to marry in Spring 2018. (Photo by Samir Hussein/Samir Hussein/WireImage)
LONDON, ENGLAND - NOVEMBER 27: Prince Harry and Meghan Markle during an official photocall to announce the engagement of Prince Harry and actress Meghan Markle at The Sunken Gardens at Kensington Palace on November 27, 2017 in London, England. Prince Harry and Meghan Markle have been a couple officially since November 2016 and are due to marry in Spring 2018. (Photo by Chris Jackson/Getty Images)
TORONTO, ON - SEPTEMBER 30: Meghan Markle and Prince Harry are seen at the Closing Ceremony on day 8 of the Invictus Games Toronto 2017 at the Air Canada Centre on September 30, 2017 in Toronto, Canada. The Games use the power of sport to inspire recovery, support rehabilitation and generate a wider understanding and respect for the Armed Forces. (Photo by Karwai Tang/WireImage)
TORONTO, ON - SEPTEMBER 30: Meghan Markle and Prince Harry are seen on day 8 of the Invictus Games Toronto 2017 on September 30, 2017 in Toronto, Canada. The Games use the power of sport to inspire recovery, support rehabilitation and generate a wider understanding and respect for the Armed Forces. (Photo by Karwai Tang/WireImage)
TORONTO, ON - SEPTEMBER 25: Meghan Markle and Prince Harry attend the Wheelchair Tennis on day 3 of the Invictus Games Toronto 2017 at Nathan Philips Square on September 25, 2017 in Toronto, Canada. The Games use the power of sport to inspire recovery, support rehabilitation and generate a wider understanding and respect for the Armed Forces. (Photo by Karwai Tang/WireImage)
TORONTO, ON - SEPTEMBER 25: Meghan Markle and Prince Harry attend the Wheelchair Tennis on day 3 of the Invictus Games Toronto 2017 at Nathan Philips Square on September 25, 2017 in Toronto, Canada. The Games use the power of sport to inspire recovery, support rehabilitation and generate a wider understanding and respect for the Armed Forces. (Photo by Karwai Tang/WireImage)
TORONTO, ON - SEPTEMBER 25: Meghan Markle and Prince Harry attend wheelchair tennis on day 3 of the Invictus Games Toronto 2017 on September 25, 2017 in Toronto, Canada. The Games use the power of sport to inspire recovery, support rehabilitation and generate a wider understanding and respect for the Armed Forces. (Photo by Samir Hussein/Samir Hussein/WireImage)
TORONTO, ON - SEPTEMBER 25: Meghan Markle and Prince Harry attend wheelchair tennis on day 3 of the Invictus Games Toronto 2017 on September 25, 2017 in Toronto, Canada. The Games use the power of sport to inspire recovery, support rehabilitation and generate a wider understanding and respect for the Armed Forces. (Photo by Samir Hussein/WireImage)
TORONTO, ON - SEPTEMBER 25: Prince Harry (R) and Meghan Markle (L) attend a Wheelchair Tennis match during the Invictus Games 2017 at Nathan Philips Square on September 25, 2017 in Toronto, Canada (Photo by Chris Jackson/Getty Images for the Invictus Games Foundation )
TORONTO, ON - SEPTEMBER 25: Meghan Markle and Prince Harry attend the Wheelchair Tennis on day 3 of the Invictus Games Toronto 2017 at Nathan Philips Square on September 25, 2017 in Toronto, Canada. The Games use the power of sport to inspire recovery, support rehabilitation and generate a wider understanding and respect for the Armed Forces. (Photo by Karwai Tang/WireImage)
TORONTO, ON - SEPTEMBER 25: Prince Harry (R) and Meghan Markle (L) attend a Wheelchair Tennis match during the Invictus Games 2017 at Nathan Philips Square on September 25, 2017 in Toronto, Canada (Photo by Chris Jackson/Getty Images for the Invictus Games Foundation)
HIDE CAPTION
SHOW CAPTION
of
SEE ALL
BACK TO SLIDE

 

Markle is aiming for "simple and elegant." And if her personal style is any indication of how she'll look during her nuptials, we already know she'll look effortlessly stunning.

The source also tells ET that Prince William, who is expected to serve as best man, and Kate Middleton's two children, Prince George, 4, and Princess Charlotte, 2, will play a special role at the ceremony as page boy and flower girl.

As ET previously reported, Markle would also like both of her parents to be involved. The brunette beauty has already asked her father, Thomas, to walk her down the aisle. 

"She does want him included and she wants to uphold tradition," an additional source explained last month.

Watch the video below to hear more on how Prince Harry and Markle are preparing for their royal wedding.

Related: Inside the queen's 1947 nuptials 

24 PHOTOS
Queen Elizabeth's wedding to Prince Philip
See Gallery
Queen Elizabeth's wedding to Prince Philip
Princess Elizabeth, later Queen Elizabeth II with her husband Phillip, Duke of Edinburgh, after their marriage, 1947. (Photo by © Hulton-Deutsch Collection/CORBIS/Corbis via Getty Images)
Princess Elizabeth marries Lieutenant Philip Mountbatten in Westminster Abbey, 20th November 1947. The bride's father, King George VI, is on the left and Geoffrey Fisher, the Archbishop of Canterbury is presiding. (Photo by Central Press/Hulton Archive/Getty Images)
Princess Elizabeth (Queen Elizabeth II) marries the Duke of Edinburgh 20 November 1947 The wedding day picture of the happy couple Royal Wedding of Princess Elizabeth to Philip Mountbatten on 20th November 1947.
Princess Elizabeth and her husband Phillip, Duke of Edinburgh at Buckinham Palace after their marriage at Westminster Abbey, 1947. (Photo by � Hulton-Deutsch Collection/CORBIS/Corbis via Getty Images)
(Original Caption) London: Man And Wife. Eyes shining as she walks up the aisle of Westminster Abbey with her handsome, blond Prince, princess Elizabeth radiates happiness, moments after her marriage to Prince Philip, Duke of Edinburgh. Her jeweled wedding gown and the beautiful bride bouquet of orchids can be seen in fine detail in this, the first unposed portrait of the married pair.
Queen Elizabeth II, Princess Elizabeth marries Prince Philip 20 November 1947 Elizabeth arrives at Westminster Abbey with her father King George VI Royal Wedding of Princess Elizabeth to Philip Mountbatten on 20th November 1947. (Photo by NCJ Archive/Mirrorpix/Mirrorpix via Getty Images)
UNITED KINGDOM - NOVEMBER 1947: Princess Elizabeth & Prince Philip (front row center) posing with other family members as well as members of European nobility after their wedding. (Photo by British Combine/British Combine/The LIFE Picture Collection/Getty Images)
Florist Martin Longman, of Fenchurch Street, who has been appointed to make Princess Elizabeth's bouquet for her wedding to Prince Philip, at work with his assistants Mary Nelson and Constance Fears, 5th November 1947. He is keeping the design a secret until the day of the wedding. (Photo by Chris Ware/Keystone/Getty Images)
14th November 1947: The official wedding cake for HRH Princess Elizabeth's wedding. It is intricately decorated with armorial bearings of the Princess and Lieutenant Mountbatten and depicts scenes from their lives on the bottom two tiers. (Photo by Topical Press Agency/Getty Images)
14th November 1947: Mr Schur, chief confectioner at McVitie and Price, putting the final touches to the wedding cake of Princess Elizabeth and The Prince Philip, Duke of Edinburgh. The cake has four tiers and is nine feet high. (Photo by J. A. Hampton/Topical Press Agency/Getty Images)
Photograph of Princess Elizabeth and Prince Philip, Duke of Edinburgh on their wedding day. Dated 20th Century. (Photo by Universal History Archive/UIG via Getty Images)
Photograph of Princess Elizabeth and Prince Philip, Duke of Edinburgh on their wedding day. Dated 20th Century. (Photo by Universal History Archive/UIG via Getty Images)
Photograph of Princess Elizabeth and Prince Philip, Duke of Edinburgh on their wedding day. Dated 20th Century. (Photo by Universal History Archive/UIG via Getty Images)
20th November 1947: Princess Elizabeth, and The Prince Philip, Duke of Edinburgh at Buckingham Palace after their wedding. (Photo by Hulton Archive/Getty Images)
20th November 1947: Princess Elizabeth leaving Westminster Abbey, after her wedding to The Prince Philip, Duke of Edinburgh. (Photo by Topical Press Agency/Getty Images)
20th November 1947: Princess Elizabeth and the Duke of Edinburgh at Buckingham Palace, London, after their wedding ceremony at Westminster Abbey. (Photo by Keystone/Getty Images)
20th November 1947: Princess Elizabeth and the Duke of Edinburgh on the balcony of Buckingham Palace, London, waving to the crowd shortly after their wedding at Westminster Abbey. (Photo by Central Press/Getty Images)
UNITED KINGDOM - NOVEMBER 20: November 20, 1947: Princess ELIZABETH and the Duke of Edinburgh after the wedding ceremony. (Photo by Keystone-France/Gamma-Keystone via Getty Images)
UNITED KINGDOM - NOVEMBER 20: Wedding Of Princess Elizabeth And Duke Of Edinburgh. On November 20Th, 1947 (Photo by Keystone-France/Gamma-Keystone via Getty Images)
UNITED KINGDOM - NOVEMBER 20: Wedding Of Princess Elizabeth And Duke Of Edinburgh. The Royal Family At The Balcony Of Bucking (Photo by Keystone-France/Gamma-Keystone via Getty Images)
Queen Elizabeth II, Princess Elizabeth marries Prince Philip 20 November 1947 Elizabeth arrives at Westminster Abbey with her father King George VI Royal Wedding of Princess Elizabeth to Philip Mountbatten on 20th November 1947. (Photo by NCJ Archive/Mirrorpix/Mirrorpix via Getty Images)
Princess Margaret Wedding 6th May 1960. The Royal Family and bridal group wave goodbye as the bridal couple leave Buckingham Palace to board the Royal Yacht Britannia at Tower Pier for their honeymoon (Photo by Daily Mirror/Mirrorpix/Mirrorpix via Getty Images)
20th November 1947: The royal group on the balcony of Buckingham Palace after returning from the wedding ceremony between Princess Elizabeth and the Duke of Edinburgh at Westminster Abbey. (left to right) Princess Margaret (1930 - 2002), Margaret Elphinstone, Diana Bowes-Lyon, Lady Caroline Montague Douglas-Scott, Lady Elizabeth Lambert, the Marquis of Milford-Haven, Prince William, the bride and groom, Lady Mary Cambridge and Lady Pamela Mountbatten. (Photo by Topical Press Agency/Getty Images)
Princess Elizabeth and Lt Philip Mountbatten with close relatives and bridesmaids in the Throne Room at Buckingham Palace immediately ater the wedding ceremony. In the front row are (L-R) Queen Mary (the King's Mother) Princess Andrew of Greece (Duke of Edinburgh's mother) the late Prince William of Gloucester with the fellow pageboy Prince Micheal of Kent , King George VI and the Queen Mother. Back row; The bridesmaids are left to right: The Hon. Margaret Elphinstone, The Hon. Pamela Mountbatten, Lady Mary Cambridge, HRH Princess Alexandra of Kent, HRH The Princess Margaret, Lady Caroline Montagu-Douglas-Scott, Lady Elizabeth Lambart and The Hon. Diana Bowes-Lyon. (Photo by PA Images via Getty Images)
HIDE CAPTION
SHOW CAPTION
of
SEE ALL
BACK TO SLIDE

 

RELATED CONTENT:

Meghan Markle and Christina Aguilera Rock the Same Coat Just Days Apart 

Everything We Know About Meghan Markle's Future Royal Duties (Exclusive)

Newly Engaged Meghan Markle's Most Regal Red Carpet Looks, Ranked!

 

Read Full Story
JOIN THE CONVERSATION
Like AOL Lifestyle on Facebook