• Prince Charles reportedly told Princess Diana he didn't love her right before they tied the knot in July 1981.
  • Charles "didn't want to go into the wedding on a false premise," Diana's friend Penny Thornton said.
  • Diana allegedly told Thornton that she considered not attending the wedding after the "devastating" revelation.

Prince Charles and Princess Diana's grand royal wedding on July 29, 1981 seemed the stuff of fantasy—but according to one of Diana's friends, the reality was far from picture perfect. Penny Thornton, an astrologer Diana sought advice from, made a startling revelation in new ITV documentary The Diana Interview: Revenge of the Princess, as People reports: Charles reportedly told his future bride he didn't love her the day before they tied the knot.

"One of the most shocking things that Diana told me was that the night before the wedding Charles told her that he didn't love her," Thornton said in the documentary, which centers on Diana's bombshell 1995 interview with the BBC after her separation from Charles. "I think Charles didn't want to go into the wedding on a false premise. He wanted to square it with her and it was devastating for Diana."

The wedding almost didn't go ahead, Thornton shared: "She didn't want to go through with the wedding at that point, she thought about not attending the wedding," she said.

london, united kingdom   july 29  prince charles and princess diana on the balcony of buckingham palace on their wedding day  the princess is wearing a wedding dress designed by david and elizabeth emanuel  the prince is wearing naval dress uniform  photo by tim graham photo library via getty images
Tim Graham//Getty Images

According to royal biographer Ingrid Seward, Charles felt "pushed" into marrying Diana by his father, Prince Philip. "He told some of his friends that he felt pressurized into marrying Diana because Philip said, 'You’ve either got to marry her or let her go. You can’t string a … young girl [along]. She’s only 19. You can’t string her along,'" Seward told Us Weekly. "Charles…he was frightened of his father and he probably thought, 'Well, OK. I’ll marry her if that’s what you want me to do.'"