Princess Diana's complicated relationship with her stepmother revealed in new doc

A lesser-known detail about the world-famous Princess Diana is that she had a stepmother and they didn't get along — an aspect that only adds to her storybook life.

Diana was just 15 when her father, Earl John Spencer, married Raine McCorquodale following her parents' divorce. The complicated relationship between the future princess and her stepmother is chronicled in the new Smithsonian Channel documentary "Princess Diana's 'Wicked' Stepmother."

"Diana was vulnerable and hurting and she didn't like this woman stepping into her mother's shoes," said Paul Burrell, Diana's former butler and her close confidante.

Raine added to the tension when she moved into the Spencer's country home that had been in the family for hundreds of years. Raine went forward and redecorated the place. Burrell said she spent a lot of money doing it.

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Raine Spencer, stepmother of Princess Diana, through the years
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Raine Spencer, stepmother of Princess Diana, through the years
LONDON, UNITED KINGDOM - JUNE 02: Princess Diana Talking With Raine, Comtesse De Chambrun (previously Her Stepmother, Countess Raine Spencer) At A Private Viewing And Reception At Christies Of Dresses Worn By The Princess That Are For Auction To Raise Money For The Aids Crisis Trust And The Royal Marsden Hospital Cancer Fund. (Photo by Tim Graham/Getty Images)
Earl Spencer and Wife Raine (Photo by �� Quadrillion/CORBIS/Corbis via Getty Images)
The wedding of Raine Spencer and Gerald Legge, Earl of Dartmouth, St Margaret's Church, Westminster, London, July 21st 1948. (Photo by Keystone/Hulton Archive/Getty Images)
7th December 1971: From left to right, Dr Roy Strong, director of the National Portrait Gallery, Countess Dartmouth, later Raine Spencer, and cartoonist Osbert Lancaster at a party celebrating freedom for part of Somerset House in London. (Photo by John Minihan/Evening Standard/Getty Images)
Diana, The Princess Of Wales Has Lunch With Her Stepmother Raine Spencer At The Connaught Hotel In Mayfair. (Photo by Antony Jones/UK Press via Getty Images)
Lady Diana's father Edward Spencer and his wife Raine McCorquodale in Paris in 1980. (Photo by Bertrand Rindoff Petroff/Getty Images)
UNITED KINGDOM - JANUARY 01: Earl Spencer and his wife Raine in front of their home at Althorpe House (Photo by Tim Graham/Getty Images)
LONDON - FEBRUARY 24 Earl Spencer and his wife Raine Spencer meet the public outside Buckingham Palace after the announcement that Diana Spencer is to marry Prince Charles February 24, 1981 in London, England. (Photo by Anwar Hussein/Getty Images)
1984: Raine, Countess Spencer with a bouffant hair do. She is the step-mother of Diana, Princess of Wales and daughter of novelist Barbara Cartland. (Photo by Hulton Archive/Getty Images)
20th May 1985: The Earl (1924 - 1992) and Countess Spencer arriving at Spencer House for the 21st birthday of the Earl's son, Viscount Charles Althorp. The Earl is the father of Princess Diana and Prince Charles' father-in-law. (Photo by Hulton Archive/Getty Images)
ALTHORP, UNITED KINGDOM - SEPTEMBER 16: Earl Spencer And His Wife Raine At The Wedding Of His Son Charles, Viscount Althorp In Northamptonshire. (raine Mccorquodale, Countess Raine De Chambrun). (Photo by Tim Graham/Getty Images)
LONDON, UNITED KINGDOM - JANUARY 01: Earl Spencer And His Wife Raine Spencer Visiting Princess Diana In Kensington Palace. (raine Mccorquodale, Countess Raine De Chambrun Circa 1990s (Photo by Tim Graham/Getty Images)
UNITED KINGDOM - MAY 19: Countess Raine Spencer, stepmother of the Princess of Wales (Photo by Tim Graham/Getty Images)
LONDON, UNITED KINGDOM - DECEMBER 14: Raine, Comtesse De Chambrun (countess Raine Spencer) At A Gala Performance By The English National Ballet At The Banqueting House, Whitehall. (Photo by Tim Graham/Getty Images)
Raine Spencer Attends A Gala Reception & Preview Of Her 'Dresses Auction' At Christies In London. (Photo by Antony Jones/UK Press via Getty Images)
LONDON, ENGLAND - SEPTEMBER 6: Raine, Countess Spencer arrives at The Funeral of Diana Princess of Wales at Westminster Abbey, London, on September 6, 1997, in London, England. (Photo by Julian Parker/UK Press via Getty Images)
LONDON, UNITED KINGDOM - MAY 12; Raine, Countess Spencer attends her 70th Birthday party at the Ritz Hotel, on May 12, 1999 in, London, United Kingdom..( Photo by UK Press via Getty Images )
UNITED KINGDOM - JUNE 26: Raine Spencer, Hardy Amies Royal Academy Fashion Show Gala Evening, To Raise Money For The Academy, London (Photo by Dave Benett/Getty Images)
LONDON, UNITED KINGDOM - FEBRUARY 17: Raine, Countess Spencer At The Banquet Hosted By The Queen Of Denmark At The Natural History Museum In London. (Photo by Tim Graham/Getty Images)
LONDON - JUNE 6: (EMBARGOED FOR PUBLICATION IN UK TABLOID NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Raine Countess Spencer attends the annual summer party at Sotheby's, New Bond Street on June 6, 2005 in London, England. (Photo by Dave Benett/Getty Images)
LONDON - SEPTEMBER 9: Raine Spencer attends the 'Made In Italy' party at Harrods to launch their new Italian ranges on September 9, 2004 in Knightsbridge, London. (Photo by David Westing/Getty Images)
Raine, Countess Spencer attends Christmas party in honour of Dame Shirley Bassey to celebrate her 70th Birthday, kindly hosted by Von Essem Chairman, Mr Andrew Davis at Cliveden House on December 16, 2007 in Berkshire, England. (Photo by Jon Furniss/WireImage)
Lady Raine Spencer attend the launch ceremony for an in-store promotion of Malaysian craft at Harrods on February 26, 2009 in London, England. (Photo by Fred Duval/FilmMagic)
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However, Diana eventually came to understand Raine in a different way — when her own marriage to Prince Charles crumbled and she became a divorcee.

"In the end of course Diana was an outcast and Raine was an outcast as well. And so they came together in the end and became great friends," Burrell said.

"Princess Diana's 'Wicked' Stepmother" airs Monday on the Smithsonian Channel at 8 p.m. ET.

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