Princess Diana and Prince Charles
Princess Diana discovered Prince Charles and Camilla Parker Bowles' affair weeks before their royal wedding Pictured: Prince Charles and Princess Diana at Westminster Abbey, London, for a centenary service for the Royal College Of Music on Feb. 28, 1982. Getty Images/Fox Photos

Princess Diana learned about Prince Charles and Camilla Parker Bowles' affair even before she married the future king.

According to Cosmopolitan, weeks before the Prince and late Princess of Wales' royal wedding, Princess Diana discovered a parcel containing a bracelet. It was engraved with the letters "G" and "F" which apparently stood for their nicknames Gladys and Fred.

"I was still too immature to understand all the messages coming my way. And then someone in his office told me that my husband has had a bracelet made for her," Princess Diana said.

"I walked into this man's office one day and I said, 'Ooh, what's in that parcel?' And he said 'Oh, you shouldn't look at that'. So I opened it and there was the bracelet," the People's Princess continued.

According to Princess Diana, she was angry and devastated at the same time. She was hurt because her groom-to-be was not honest with her.

"I was devastated, and I said 'Well, he's going to give it to her tonight,'" Princess Diana said. "So rage, rage, rage. You know, 'Why can't you be honest with me?' But no, absolutely cut me dead."

In Princess Diana's secret interviews, she revealed that Camilla ruined their honeymoon. The Duchess of Cornwall reportedly sent Prince Charles a wedding present while they were celebrating their wedding.

Princess Diana confronted her husband at that time, but the Prince of Wales insisted that nothing was wrong with it because it was from a friend. However, Prince William and Prince Harry's mom wasn't convinced, she was too jealous that they fought over it.

In addition, Princess Diana confessed that Camilla broke her heart months before her wedding with Prince Charles. When the second-in-line to the throne was about to leave for his five-week royal tour abroad, Camilla called and Princess Diana decided to be nice, so she left the two on the phone. However, later on that day, Princess Diana was photographed sobbing and she blamed Camilla's call for it.

Prince Charles denied his affair with Camilla in a past interview. According to him, he tried to be faithful to the mother of his children. However, according to a body language expert, Judi James, while the royal appeared calm and relax during the said interview, he showed signs of impatience, anxiety, annoyance and guilt.