Prince William probably won't be Prince Harry's best man

For Prince William’s wedding in 2011, he called on his younger brother to be his best man. So when Prince Harry marries Meghan Markle in May, will he return the favor?

Acording to one royal expert, that might not be the case. Apparently, there’s actually no such thing has having a best man at a royal wedding — but William broke protocol to honor his sibling when he wed Kate Middleton.

Marlene Koenig, British and European royal expert, told Town & Country that “the best man or best men are officially called supporters.”

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Prince William, Duchess Kate and Prince Harry together
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Prince William, Duchess Kate and Prince Harry together
Britain's Kate, Duchess of Cambridge, and Prince Harry applaud Prince William after his speech during a training event to promote the charity Heads Together, at the Queen Elizabeth II Park in London, Britain, February 5, 2017. REUTERS/Alastair Grant/Pool
Britain's Prince William, Kate Duchess of Cambridge and Prince Harry (L) stand ready to give an award during a visit to The Mix in London, December 19, 2016. REUTERS/Alastair Grant/Pool
HAYES, UNITED KINGDOM - APRIL 20: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge and Prince Harry attend the official opening of The Global Academy in support of Heads Together on April 20, 2017 in Hayes, England. The Global Academy is a state school founded and operated by Global, The Media & Entertainment Group, educating students for careers in broadcasting and the digital media industry. (Photo by Max Mumby/Indigo/Getty Images)
Kate Duchess of Cambridge, Prince William, and Prince Harry (R) greet guests attending the Patron's Lunch, an event to mark Britain's Queen Elizabeth's 90th birthday, in London, June 12, 2016. REUTERS/Peter Nicholls
LONDON, ENGLAND - APRIL 05: Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge and Prince Harry attend the Service of Hope at Westminster Abbey on April 5,2017 in London, United Kingdom. The multi-faith Service of Hope was held for the four people killed when Khalid Masood committed an act of terror in Westminster on Wednesday March 22. Survivors, bereaved families and members of the emergency services joined The Duke and Duchess of Cambridge, Prince Harry, the Home Secretary, Amber Rudd and London Mayor, Sadiq Khan, in the congregation. (Photo by Dan Kitwood/Getty Images)
LONDON, UNITED KINGDOM - FEBRUARY 05: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Prince Harry, Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge join a Team Heads Together London Marathon Training Day at the Queen Elizabeth Olympic Park on February 5, 2017 in London, England. (Photo by Max Mumby/Indigo/Getty Images)
The Duke and Duchess of Cambridge and Prince Harry leaving the Institute of Contemporary Art in London where they outlined the next phase of their mental health Heads Together campaign.
Catherine Duchess of Cambridge, Prince William, Duke of Cambridge and Prince Harry visit the Visitors Centre during the Somme centenary commemorations at the Thiepval memorial in France on July 01, 2016
The Duke and Duchess of Cambridge and Prince Harry at the Patron's Lunch in The Mall, central London in honour of the Queen's 90th birthday, in an open topped Range Rover.
Prince Harry, the Duke and Duchess of Cambridge leave St Paul's Cathedral in London following a national service of thanksgiving to celebrate the 90th birthday of Queen Elizabeth II.
Prince William, Duke of Cambridge, Prince Harry and Catherine, Duchess of Cambridge, wearing a skirt by Banana Republic and a blouse by GOAT Fashion, arrive to attend the launch of the Heads Together campaign at Olympic Park in London on May 16, 2016
The Duke of Cambridge (left), The Duchess of Cambridge (centre) and Prince Harry (right) attend the World Premiere of Spectre, held at the Royal Albert Hall in London.
The Duke and Duchess of Cambridge and Prince Harry arriving for the annual Commonwealth Day service at Westminster Abbey, London, on Commonwealth Day.
Catherine, Duchess of Cambridge, Prince William, Duke of Cambridge and Prince Harry visit The Tower Of London's Ceramic Poppy installation 'Blood Swept Lands and Seas of Red' by artist Paul Cummins, commemorating the 100th anniversary of the outbreak of First World War.
The Duke and Duchess of Cambridge and Prince Harry watch riders at the finish line of Stage 1 of the Tour de France in Harrogate.
Prince Harry, the Duchess of Cambridge and the Duke of Cambridge watch a fly-past by the RAF on the balcony at Buckingham Palace following the Trooping the Colour parade, London.
Prince Harry, the Duchess and Duke of Cambridge with their wands on the set used to depict Diagon Alley in the Harry Potter Films during their visit to Warner Bros studios in Leavesden, Herts where the popular movies were produced.
The Duke and Duchess of Cambridge watch with Prince Harry during the Team Eventing Jumping Final on day four of the London Olympic Games at Greenwich Park, London.
The Duke and Duchess of Cambridge and Prince Harry chat with children during a visit to Bacon's College in Greenwich, London, where they attended the launch of a new sports project that aims to train the next generation of sports coaches.
Prince William (left), Catherine, Duchess of Cambridge and Prince Harry stand on the balcony at Buckingham Palace during the Diamond Jubilee celebrations in central London.
The Duke and Duchess of Cambridge talks to Prince Harry before a reception in the Waterloo Chamber, before her Sovereign Monarchs Jubilee lunch at Windsor Castle.
Prince William and his bride Kate leave Westminster Abbey, London, after their wedding, followed by Prince Harry (rear, left) and Pippa Middleton (rear, right).
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She did add that “William will probably be Harry’s supporter,” carrying on the sibling tradition that was also displayed by the brothers’ father, Prince Charles. For his wedding to Princess Diana in 1981, he chose his brothers, Edward and Andrew, to be his “supporters.”

It’s also likely that William will plan his younger brother’s bachelor party. Although William’s affair was kept well under wraps, a royal insider told Brides that Harry hosted his brother’s “at a country estate about a month before the wedding.”

As for the rest of the wedding party, Prince George and Princess Charlotte will likely serve as page boy and bridesmaid, respectively, Koenig noted, but “anyone else is a guess.”

Markle’s bridesmaids are also a mystery. While many expect her A-list friends such as Serena Williams and Priyanka Chopra to be invited to the nuptials, it’s likely the royal family will want to steer clear of a celebrity wedding.

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The Royal Wedding: Prince William marries Kate Middleton
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The Royal Wedding: Prince William marries Kate Middleton
ATTENTION EDITORS - EMBARGO, RELEASABLE TUESDAY 29 MARCH AT 0001 GMT - THIS RESTRICTION APPLIES TO ALL MEDIA, INCLUDING WEBSITES Royal Demi Chef De Partie, Shaun Mason (L) and Royal Chef Mark Flanagan, Head of Kitchens at Buckingham Palace, work in the kitchens at Buckingham Palace, London on March 25, 2011, as preparations for the forthcoming wedding of Prince William and Kate Middleton are underway. The second-in-line to the throne marries his university sweetheart on April 29 at Westminster Abbey, in an event that has become a global media sensation ever since they announced their engagement last November. AFP PHOTO/WPA POOL/Nick Ansell (Photo credit should read Nick Ansell/AFP/Getty Images)
ATTENTION EDITORS - EMBARGO, RELEASABLE TUESDAY 29 MARCH AT 0001 GMT - THIS RESTRICTION APPLIES TO ALL MEDIA, INCLUDING WEBSITES Jennifer Scott, Assistant Curator of Paintings, looks up at her favourite painting as she walks past a Canaletto, Venice towards Santa Maria Della Salute (1723), in the Picture Gallery at Buckingham Palace, London, which will be one of the rooms used during the wedding reception of Prince William and Kate Middleton London on March 25, 2011. The second-in-line to the throne marries his university sweetheart on April 29 at Westminster Abbey, in an event that has become a global media sensation ever since they announced their engagement last November.AFP PHOTO/WPA POOL/Nick Ansell (Photo credit should read Nick Ansell/AFP/Getty Images)
ATTENTION EDITORS - EMBARGO, RELEASABLE TUESDAY 29 MARCH AT 0001 GMT - THIS RESTRICTION APPLIES TO ALL MEDIA, INCLUDING WEBSITES A chef of the Royal Household at Buckingham Palace, London, holds a tray of canapes akin to that which is usually served at receptions held at the palace, in the kitchens at Buckingham Palace, London on March 25, 2011, as preparetions for the forthcoming wedding of Prince William and Kate Middleton are underway. The second-in-line to the throne marries his university sweetheart on April 29 at Westminster Abbey, in an event that has become a global media sensation ever since they announced their engagement last November. AFP PHOTO/WPA POOL/Nick Ansell (Photo credit should read Nick Ansell/AFP/Getty Images)
UK - Wedding of Prince William & Kate Middleton - Buckingham Palace (Photo by Stephane Cardinale/Corbis via Getty Images)
(FILE PHOTO) In this composite image a comparison has been made between the Royal Wedding Cathedral aisle walks of Prince Charles, Prince of Wales and Lady Diana Spencer with that of Prince William and Catherine, Duchess of Cambridge.(Left Image) LONDON, UNITED KINGDOM - JULY 29: The Wedding Of Prince Charles To Lady Diana Spencer Held At St Paul's Cathedral In London. A General View Of The Prince And Princess Of Wales Walking Arm-in-arm Down The Aisle With Their Bridesmaids And Pageboys. (Photo by Tim Graham/Getty Images)(Right image) LONDON, ENGLAND - APRIL 29: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge leave Westminster Abbey following their marriage ceremony, on April 29, 2011 in London, England. The marriage of Prince William, the second in line to the British throne, to Catherine Middleton is being held in London today. The marriage of the second in line to the British throne is to be led by the Archbishop of Canterbury and will be attended by 1900 guests, including foreign Royal family members and heads of state. Thousands of well-wishers from around the world have also flocked to London to witness the spectacle and pageantry of the Royal Wedding. (Photo by Dave Thompson- WPA Pool/Getty Images)
FLECKNEY, UNITED KINGDOM - MARCH 24: Cake designer Fiona Cairns, who has been commissioned by Prince William and Kate Middleton to create a multi-tiered traditional fruit cake for their wedding, holds a tray of decorations for the cake March 24, 2011 in Fleckney, Leicestershire, England. The wedding will take place on April 29, 2011. (Photo by Rui Vieira - WPA Pool/Getty Images)
LONDON, ENGLAND - APRIL 28: Catherine Middleton arrives at The Goring Hotel after visiting Westminster Abbey on April 28, 2011 in London, England. With less than 24 hours to go final preparations for the wedding of Prince William and Catherine Middleton are in place. (Photo by Christopher Furlong/Getty Images)
ROME, ITALY - APRIL 28: The British Embassy in Rome presents a book of signatures to celebrate the royal wedding of Prince William and Kate Middleton on April 28, 2011 in Rome, Italy. The wedding of Britain's Prince William and his fiancee Kate Middleton will be celebrated at Westminster Abbey in London on April 29, 2011. (Photo by Giorgio Cosulich/Getty Images)
LONDON, ENGLAND - APRIL 29: Guests arrive at Westminster Abbey ahead of the Royal Wedding of Prince William to Catherine Middleton at Westminster Abbey on April 29, 2011 in London, England. The marriage of the second in line to the British throne is to be led by the Archbishop of Canterbury and will be attended by 1900 guests, including foreign Royal family members and heads of state. Thousands of well-wishers from around the world have also flocked to London to witness the spectacle and pageantry of the Royal Wedding. (Photo by Dominic Lipinski - WPA Pool/Getty Images)
LONDON, ENGLAND - APRIL 29: Servicemen in Full Dress arrive to attend the Royal Wedding of Prince William to Catherine Middleton at Westminster Abbey on April 29, 2011 in London, England. The marriage of the second in line to the British throne is to be led by the Archbishop of Canterbury and will be attended by 1900 guests, including foreign Royal family members and heads of state. Thousands of well-wishers from around the world have also flocked to London to witness the spectacle and pageantry of the Royal Wedding. (Photo by Dan Kitwood/Getty Images)
LONDON, ENGLAND - APRIL 29: Crowds pose for a portrait during the Royal Wedding of Prince William to Catherine Middleton on April 29, 2011 in London, England. The marriage of the second in line to the British throne was led by the Archbishop of Canterbury and was attended by 1900 guests, including foreign Royal family members and heads of state. Thousands of well-wishers from around the world have also flocked to London to witness the spectacle and pageantry of the Royal Wedding. (Photo by Dave Hogan/GP) (Photo by Dave Hogan/GP/Getty Images)
LONDON, ENGLAND - APRIL 29: (Centre) David Beckham and Victoria Beckham arrive to attend the Royal Wedding of Prince William to Catherine Middleton on April 29, 2011 in London, England. The marriage of the second in line to the British throne was led by the Archbishop of Canterbury and was attended by 1900 guests, including foreign Royal family members and heads of state. Thousands of well-wishers from around the world have also flocked to London to witness the spectacle and pageantry of the Royal Wedding. (Photo by Georges De Keerle/GP/Getty Images)
LONDON, ENGLAND - APRIL 29: Guests arrive to attend the Royal Wedding of Prince William to Catherine Middleton on April 29, 2011 in London, England. The marriage of the second in line to the British throne was led by the Archbishop of Canterbury and was attended by 1900 guests, including foreign Royal family members and heads of state. Thousands of well-wishers from around the world have also flocked to London to witness the spectacle and pageantry of the Royal Wedding. (Photo by Georges De Keerle/GP/Getty Images)
Queen Sofia of Spain departs Claridge's hotel to attend the wedding of Prince William and Miss Catherine Middleton on April 29, 2011 in London, England.
A military marching band perform as they march along the processional route on the day of the wedding of Britain's Prince William and Kate Middleton, on April 29, 2011, in central London. AFP PHOTO / PIERRE-PHILIPPE MARCOU (Photo credit should read PIERRE-PHILIPPE MARCOU/AFP/Getty Images)
LONDON, ENGLAND - APRIL 29: Tara Palmer-Tomkinson arrives to attend the Royal Wedding of Prince William to Catherine Middleton at Westminster Abbey on April 29, 2011 in London, England. The marriage of the second in line to the British throne is to be led by the Archbishop of Canterbury and will be attended by 1900 guests, including foreign Royal family members and heads of state. Thousands of well-wishers from around the world have also flocked to London to witness the spectacle and pageantry of the Royal Wedding. (Photo by Mike Marsland/WireImage)
LONDON, ENGLAND - APRIL 29: Crowds pose for a portrait during the Royal Wedding of Prince William to Catherine Middleton on April 29, 2011 in London, England. The marriage of the second in line to the British throne was led by the Archbishop of Canterbury and was attended by 1900 guests, including foreign Royal family members and heads of state. Thousands of well-wishers from around the world have also flocked to London to witness the spectacle and pageantry of the Royal Wedding. (Photo by Dave Hogan/GP) (Photo by Dave Hogan/GP/Getty Images)
A military division march in front of Westminster Abbey in London on the day of the wedding of Britain's Prince William and Kate Middleton, on April 29, 2011. AFP PHOTO / ODD ANDERSEN (Photo credit should read ODD ANDERSEN/AFP/Getty Images)
LONDON, ENGLAND - APRIL 29: Prince William and Catherine Middleton at the altar during their wedding service in Westminster Abbey on April 29, 2011 in London, England. The marriage of the second in line to the British throne is being led by the Archbishop of Canterbury and will be attended by 1900 guests, including foreign Royal family members and heads of state. Thousands of well-wishers from around the world have also flocked to London to witness the spectacle and pageantry of the Royal Wedding. (Photo by Anthony Devlin - WPA Pool/Getty Images)
LONDON, ENGLAND - APRIL 29: Catherine Middleton waves to the crowds as she arrives to attend her Royal Wedding to Prince William on April 29, 2011 in London, England. The marriage of the second in line to the British throne was led by the Archbishop of Canterbury and was attended by 1900 guests, including foreign Royal family members and heads of state. Thousands of well-wishers from around the world have also flocked to London to witness the spectacle and pageantry of the Royal Wedding. (Photo by Georges De Keerle/GP/Getty Images)
LONDON, ENGLAND - APRIL 29: Prince William sings beside his bride Catherine Middleton during their wedding at Westminster Abbey on April 29, 2011 in London, England. The marriage of Prince William, the second in line to the British throne, to Catherine Middleton is being held in London today. The marriage of the second in line to the British throne is to be led by the Archbishop of Canterbury and will be attended by 1900 guests, including foreign Royal family members and heads of state. Thousands of well-wishers from around the world have also flocked to London to witness the spectacle and pageantry of the Royal Wedding. (Photo by Andrew Milligan - WPA Pool/Getty Images)
LONDON, ENGLAND - APRIL 29: Prince William and his new bride Catherine Middleton stand in front of the altar during the service on April 29, 2011 in London, England. The marriage of Prince William, the second in line to the British throne, to Catherine Middleton is being held in London today. The marriage of the second in line to the British throne is to be led by the Archbishop of Canterbury and will be attended by 1900 guests, including foreign Royal family members and heads of state. Thousands of well-wishers from around the world have also flocked to London to witness the spectacle and pageantry of the Royal Wedding. (Photo by Dominic Lipinski - WPA Pool/Getty Images)
LONDON, ENGLAND - APRIL 29: Prince William, Duke of Cambridge and his new bride Catherine, Duchess of Cambridge walk down the aisle at the close of their wedding ceremony at Westminster Abbey on April 29, 2011 in London, England. The marriage of Prince William, the second in line to the British throne, to Catherine Middleton is being held in London today. The Archbishop of Canterbury conducted the service which was attended by 1900 guests, including foreign Royal family members and heads of state. Thousands of well-wishers from around the world have also flocked to London to witness the spectacle and pageantry of the Royal Wedding and street parties are being held throughout the UK. (Photo by Richard Pohle-WPA Pool/Getty Images)
LONDON, ENGLAND - APRIL 29: (L-R) Michael Middleton, Carole Middleton, Prince Charles, The Prince of Wales with Camilla, Duchess of Cornwall and Eliza Lopes, Lady Louise Windsor, Grace van Cutsem, Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge and Margarita Armstrong-Jones, page boys Tom Pettifer and William Lowther-Pinkerton with Queen Elizabeth II, Prince Philip, the Duke of Edinburgh, Pippa Middleton, Prince Harry and James Middleton greet well-wishers from the balcony at Buckingham Palace on April 29, 2011 in London, England. The marriage of the second in line to the British throne was led by the Archbishop of Canterbury and was attended by 1900 guests, including foreign Royal family members and heads of state. Thousands of well-wishers from around the world have also flocked to London to witness the spectacle and pageantry of the Royal Wedding. (Photo by Peter Macdiarmid/Getty Images)
Prince William and his wife Kate Middleton, Duchess of Cambridge, kiss on the balcony of Buckingham Palace in London, following their wedding on April 29, 2011. AFP PHOTO / WPA POOL / JOHN STILLWELL (Photo credit should read JOHN STILLWELL/AFP/Getty Images)
LONDON, ENGLAND - APRIL 29: Catherine Middleton and her father Michael Middleton arrive to attend the Royal Wedding of Prince William to Catherine Middleton at Westminster Abbey on April 29, 2011 in London, England. The marriage of the second in line to the British throne is to be led by the Archbishop of Canterbury and will be attended by 1900 guests, including foreign Royal family members and heads of state. Thousands of well-wishers from around the world have also flocked to London to witness the spectacle and pageantry of the Royal Wedding. (Photo by Warren Little/Getty Images)
Kate Middleton, accompanied by her father Michael Middleton arrives at the West Door of Westminster Abbey in London for her wedding to Britain's Prince William, on April 29, 2011. AFP PHOTO / BEN STANSALL (Photo credit should read BEN STANSALL/AFP/Getty Images)
Britain's Prince Charles travels to Westminster Abbey in London for the wedding of Britain's Prince William and Kate Middleton, on April 29, 2011. AFP PHOTO / MARTIN BUREAU (Photo credit should read MARTIN BUREAU/AFP/Getty Images)
Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge depart after their Wedding at Westminster Abbey on April 29, 2011 in London, England.
Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge greet wellwishers from the balcony next to (L-R) Lady Louise Windsor, Grace Van Cutsem at Buckingham Palace on April 29, 2011 in London, England. (Photo by George Pimentel/WireImage)
Sister of the Bride and Maid of Honour Pippa Middleton depart the Royal Wedding of Prince William to Catherine Middleton at Westminster Abbey on April 29, 2011 in London, England. The marriage of the second in line to the British throne is to be led by the Archbishop of Canterbury and will be attended by 1900 guests, including foreign Royal family members and heads of state. Thousands of well-wishers from around the world have also flocked to London to witness the spectacle and pageantry of the Royal Wedding. (Photo by Ferdaus Shamim/WireImage)
(L-R) Michael Middleton, Carole Middleton, Eliza Lopes, Prince Charles, Prince of Wales, Camilla, Duchess of Cornwall and Lady Louise Windsor stand on balcony of Buckingham Palace following the wedding of TRH Prince William, Duke of Cambridge and Catherine, Duchesss of Cambridge on April 29, 2011 in London, England. (Photo by George Pimentel/WireImage)
Kate Middleton, left, arrives for her wedding with Britain's Prince William as her maid of honor Pippa Middleton holds the train at Westminster Abbey in London. (Photo by Brooks Kraft LLC/Corbis via Getty Images)
UK - Royal Wedding of Prince William and Kate (Catherine) Middleton - Kate Middleton waves to the crowd along the Mall for the trip to Westminster Abbey 29th April 2011 London UK (Photo by Paul Cunningham/Corbis via Getty Images)
UK - Royal Wedding of Prince William and Kate (Catherine) Middleton - return along the Mall in an open Landau to Buckingham Palace 29th April 2011 London UK (Photo by Paul Cunningham/Corbis via Getty Images)
Britain's Prince William and his wife Catherine, Duchess of Cambridge, leave after their wedding in Westminster Abbey in the 1902 State Landau along the Procession Route, in central London. (Photo by Brooks Kraft LLC/Corbis via Getty Images)
Princess Anne arrives at Westminster Abbey for the wedding ceremony of Britain's Prince William and his wife Catherine, Duchess of Cambridge, in central London. (Photo by Brooks Kraft LLC/Corbis via Getty Images)
Camilla, Duchess of Cornwall, departs Westminster Abbey after the service at the Royal Wedding in London. (Photo by Brooks Kraft LLC/Corbis via Getty Images)
HRH Prince William and Princess Catherine in the procession after their Royal wedding at Westminster Abbey . (Photo by rune hellestad/Corbis via Getty Images)
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