Princess Diana's waist shrunk by five inches in run up to wedding, says dress designer

Princess Diana's waist shrunk by five inches in the run up to her 1981 wedding {Image: Getty]

When Princess Diana married Prince Charles pictures of her smiling face were beamed via TV screens around the world.

Yet, behind the scenes of the 1981 wedding - which took place 37 years ago tomorrow - the late royal had been left "in tears" by the discovery that the first-in-line to the throne was still in love with Camilla Parker Bowles.

Diana, then just 20 years old, had seen her waist shrink by more than five inches in just four months, according to the designer of the iconic dress she wore down the aisle at St Paul's Cathedral in London.

The mother of Prince William and Prince Harry later revealed the stress of the nuptials, and a consequent eating disorder, had been behind her drastic weight loss.

Speaking in a new Channel 5 documentary - Charles and Di: The Truth Behind Their Wedding - which aired last night, designer Elizabeth Emmanuel told how the stunning white dress had to be altered several times to fit Diana's increasingly small frame.

"She did lose weight, she was losing so much, we even had to start again a couple of times, even after cutting into the fabric," she explained, of the story behind the gown which she co-created with ex-husband David.

"Her waist was a size 23 at the end. She was tiny like a model."

34 PHOTOS
Wedding of Charles and Diana
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Wedding of Charles and Diana
Lady Diana Spencer with her father Earl Spencer on their way to St. Pauls Cathedral in the City of London, for her marriage to The Prince of Wales.
Exactly a month before the Royal wedding and Fred English, 85, patriotic from hat to shows, has his Manor Road house in East Molesey, Surrey, decorated for the Royal wedding.
THE OFFICIAL ROYAL WEDDING CAKE FOR DIANA SPENCER AND PRINCE CHARLES MADE BY THE ROYAL NAVY'S COOKERY SCHOOL 5FT HIGH AND 255 ILBS HMS PEMBROKE IN CHATHAM
A London Routemaster bus painted with ribbons and bows to look like a giant wedding present.
James Cleverley, 7, and Leisa Winstanley, 11, with their winning plate designs made up to become rare Royal Wedding Presents and presented to them in London. The plates were hand painted and made into a limited edition - one for each of the children and one of each for Prince Charles and Lady Diana. James of Horningstoft, Norfolk and Leisa, from Truro, Cornwall, entered their designs in the Blue Peter Royal Wedding Plate competition on the BBC.
A message from the City of London Corporation pasted onto the railway bridge at the bottom of Ludgate Hill, London, and destined to be read by the Prince of Wales and Lady Diana Spencer when they are en route to their wedding at St. Paul's Cathedral.
A firework display in Hyde Park, London, to celebrate the marriage of Prince Charles and Lady Diana Spencer.
Grandmother Kathleen Lucus knits to pass away the hours outside Buckingham Palace, London, one of many who have made all night vigils waiting for the Royal wedding of Lady Diana Spencer to Prince Charles.
Scenes outside St Paul's Cathedral in London as young and old awaken from a night in sleeping bags to secure vantage points for seeing the royal wedding.
Brian Balmer, a 19 year old Student from Hindsford, Atherton near manchester, stakes his claim to a seat outside at St. Paul's Cathedral to watch the wedding.
Nancy Reagan at Fitzroy Square in London. She will represent her husband, US President Ronald Reagan, at the wedding of Prince Charles and Princess Diana.
Balloons join the escort of the Blues & Royals for Prince Charles and the Princess of Wales as they drive in an open landau to Waterloo Station from Buckingham Palace. Behind is Lt Col Andrew Parker-Bowles
Earl Spencer (right) accompanies his daughter Lady Diana Spencer at her wedding to the Prince of Wales at St Paul's Cathedral, London.
A FINAL WAVE TO THE CROWDS FROM THE PRINCE OF WALES ACCOMPANIED BY PRINCE ANDREW (RIGHT) BEFORE ENTERING ST. PAUL'S CATHEDRAL, LONDON
Earl Spencer (right), accompanies his daughter Lady Diana at her wedding to the Prince of Wales, at St Paul's Cathedral, in London. * 25/1/96 A Church of Scotland clergyman claimed that the Earl confessed to him in 1947 that he had a romance with the young Princess Elizabeth before she became Queen.
Earl Spencer leads his daughter, Lady Diana Spencer, down the aisle in St Paul's Cathedral, for her wedding to the Prince of Wales. * 29/7/81 of Earl Spencer leading his daughter Lady Diana Spencer down the aisle of St Paul's Cathedral, London, for her wedding to the Prince of Wales.
On the balcony, Buckingham Palace, the Princess of Wales laughs as she places her hand on the shoulder of Edward Van Cutsem, one of the Page boys at her wedding to the Prince of Wales. Also visible are Clementine Hambro (a bridesmaid) and Nicholas Windsor (Page Boy).
The newly married Prince and Princess of Wales (formerly Lady Diana Spencer) kiss on the balcony of Buckingham Palace after their wedding ceremony at St. Paul's cathedral.
The Prince of Wales and his bride Lady Diana Spencer during their wedding ceremony at St Paul's Cathedral.
The Prince and Princess of Wales leave St. Paul's Cathedral in a carriage after their wedding on 29 July 1981. Anwar Hussein/allactiondigital.com
The official group photo at the wedding of the Prince and Princess of Wales.
The Queen Mother and Prince Andrew, driving back from St Paul's in an open carriage after the wedding of Prince Charles to Lady Diana Spencer.
The Princess of Wales in her bridal gown at Buckingham Palace after her marriage to Prince Charles at St. Paul's Cathedral.
Prince Charles, Prince of Wales and Diana, Princess of Wales leave St. Pauls Cathedral in London following their wedding on July 29, 1981.
Diana, Princess of Wales is led down the aisle of St. Paul's Cathedral by her proud father, Earl Spencer, on her wedding to Prince Charles, Prince of Wales on 29 July 1981.
Diana, Princess of Wales enters St. Paul's Cathedral on the hand of her father, Earl Spencer, for her marriage to Prince Charles, Prince of Wales on 29 July 1981.
Queen Elizabeth II and the Duke of Edinburgh make their way to St Paul's Cathedral for the wedding of the Prince of Wales and Lady Diana Spencer.
**FILE PHOTO** Diana, Princess of Wales, wearing an Emanuel wedding dress, and Prince Charles, Prince of Wales leave St. Paul's Cathedral following their wedding on 29 July 1981. Designers Elizabeth and David Emanuel are holding an auction of dresses worn by the late Princess Diana. The dresses are to go up for auction on June 8, 2010 in London, at specialist vintage fashion auctioneers Kerry Taylor Auctions.
The Prince of Wales and Prince Andrew make their way to St Paul's Cathedral
The Duchess of Kent and her daughter Lady Helen Windsor on route to St Paul's Cathedral for the wedding of the Prince of Wales and Lady Diana Spencer
The newly married Prince and Princess of Wales leaving St Paul's Cathedral past the Press Association Building on Fleet Street, on their way back to Buckingham Palace.
The Prince and Princess of Wales walking down the aisle after the wedding service at St Paul's Cathedral.
The Prince and Princess of Wales on the balcony at Buckingham Palace after their wedding
The Prince of Wales, and his supporters, Prince Andrew and Prince Edward, arrive at St Paul's Cathedral for his wedding to Lady Diana Spencer.
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The dress for what was billed as a "fairytale wedding" went on to spark a number of bridal trends.

In the days leading up to the wedding, Diana - who passed away in 1997 - discovered a package with Camilla's name on it.

It contained a bracelet from Charles, then 32, for the woman who would become his second wife.

"She was absolutely in tears, in a terrible state about it. And it was clear that it was Prince Charles' farewell present to Camilla," explained Christopher Wilson, a royal expert, on the programme.

51 PHOTOS
Princess Diana
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Princess Diana
File photo dated 29/6/1994 of the Princess of Wales arriving at the Serpentine Gallery in London's Hyde Park to attend a gala dinner as its patron. Twenty-five years ago, the Princess of Wales stepped out in her "revenge dress".
Diana and the Queen snapped in good spirits.
TETBURY, UNITED KINGDOM - JULY 18: Princess Diana Resting Her Head In Her Hands Whilst Sitting On The Steps Of Her Home At Highgrove, Gloucestershire. (Photo by Tim Graham Photo Library via Getty Images)

The Princess of Wales rides in the passenger seat of a vintage Mercedes-Benz.

Princess Diana, Prince Harry, Prince William, Prince Charles at William's first day at Eton.
circa 1965: A young Lady Diana Spencer (1961 - 1997), later the wife of Prince Charles.
Prince Charles and his fiancee Lady Diana Spencer with Queen Elizabeth II at Buckingham Palace, 7th March 1981.
Prince Charles  and Lady Diana Spencer on their wedding day.
Prince Charles and Lady Diana Spencer on their wedding day.
Prince Charles, the Prince of Wales kissing his wife, Princess Diana (1961 - 1997), on the balcony of Buckingham Palace after their marriage.
Princess Diana on her wedding day.
(FILE PHOTO) The Prince and Princess of Wales leave St Paul's Cathedral after their wedding, 29th July 1981. She wears a wedding dress by David and Elizabeth Emmanuel and the Spencer family tiara.
A pregnant Princess of Wales joins the royal family on the balcony of Buckingham Palace for the Trooping of the Colour ceremony, June 1982. The Queen, Prince Philip, Princess Alexandra of Kent and Angus Ogilvy are among the group. 
(FILE PHOTO) The Princess of Wales attends a dinner held by President Ghulam Ishaq Khan in Islamabad during her official visit to Pakistan, September 1991.
Princess Diana pictured in a tiara.

Diana looks deep in thought on her wedding day.

Princess Diana smiles for the cameras.
Princess Diana in a stylish evening gown.
Princess Diana and Prince Philip at a polo match in Windsor on July 26th , 1987.
Prince Charles and Princess Diana leave St. Mary’s Hospital in London, with Prince Harry on September 16, 1984.
Princess Diana with her sons William and Harry in 1995.
Princess Diana pictured in a stylish beret.
Princess Diana is snapped in India.
Princess Diana doing charity work.
Princess Diana holding Harry as a baby.
Princess Diana meeting members of the public.
Princess Diana poses in a bikini during a holiday.
Diana beams as she sits with William and Harry.
Princess Diana pictured with young William.
Princess Diana is seen holding hands with her two young sons William and Harry.
Princess Diana with William and Harry.
Diana with her sons in December 1995.
Diana pictured with Charles.

An adorable Prince William and Prince Harry can be seen standing beside their mother, Princess Diana, as a little girl gives flowers to the Queen Mother in 1991.

Prince Charles, Prince of Wales, kissing Princess Diana, Princess of Wales, at a polo match.
Diana gets involved in a parents' day race.

Diana dazzles in a green frock.

Diana and Charles pictured at a glamorous evening event.
Diana and Charles pose for a formal picture.
Charles and Diana boarding a flight.
Charles and Diana as newlyweds.
Diana sporting a casual look.

Diana wears a tartan outfit to match Charles' kilt for a trip to Scotland.

A young Diana shows off sapphire sparkler.
Diana dazzles in white frock and tiara during trip to the Middle East.
Diana pictured with baby Harry.
Diana poses for pictures with members of the public during a walkabout.
Diana and Charles enjoy a family day out.
Diana pictured alongside a stern-faced Queen.
Diana pictured alongside Princess Anne.
TETBURY, UNITED KINGDOM - JULY 18: Princess Diana Resting Her Head In Her Hands Whilst Sitting On The Steps Of Her Home At Highgrove, Gloucestershire. (Photo by Tim Graham Photo Library via Getty Images)
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