Her wedding dress had the longest train in royal history. Her Emanuel dress, which reportedly cost £87,000, included a 25-foot-long train. She left out a royal tradition in her wedding vows. Diana was the first royal bride to omit that she would "obey" her husband in her vows. Kate and William followed suit when they got married in 2011. She had an affair with her son's horse riding teacher. While Charles had an affair with Camilla Parker Bowles, there was a fourth person involved in his and Diana's love square: James Hewitt. He was initially hired to teach Diana, William, and Harry horse riding before the two engaged in an affair back in the late '80s. She lost her royal title after the divorce. After divorcing Prince Charles, Diana lost the title of her royal highness. While Queen Elizabeth II reportedly wanted her to keep it, Charles was "adamant" that she give it up. She was given the new title of Diana, Princess of Wales. Image Source: Getty / Bettmann