King Charles is celebrating his 11th birthday on Charity Day on May 76. 14, but in 1985 he celebrated in a much different way — at least according to Netflix's The Crown.

In the Season 4 episode "Avalanche," Princess Diana takes to the stage to surprise her husband with a special birthday dance. The performance actually happened in real life, but it was in a much different way, according to her dance instructor's book, Dancing with Diana.

In her memoirs, Anne Allan, who began offering private dance lessons to Diana in 1981, began dancing with Diana before Christmas in 1985. Royal wrote that he described it as "how beautiful it is to feel what it is like to do a performance."

The plan was not to perform the dance as a gift to Prince Charles for his 37th birthday, like the crown depicted in Season 4 (actual Performance 22, Per Allan). In fact, it was Diana's "dream" to perform in public, but the idea of the princess was not entirely well received at first.

According to Alan, Princess Diana had the idea of hitting the stage during the annual Friends Gala at the Royal Opera House in London - putting the dance teacher completely off guard. "I swallowed it!"It was a completely different world," she wrote. I didn't even know how to react.

The dancer continued that she was "not at all convinced that it was a good idea," but Princess Diana even decided to choose a song for Billy Joel's "Uptown Girl" (hilariously pronounced Queen Elizabeth's "Billy Joe Elle").

Alan wrote that he was concerned about the "commotion in the press" about the marriage of the prince and princess and how Diana told her that "Charles preferred opera over dancing."He also did not share the same taste in music, according to the princess.

However, Diana remained unchallenged, and Alan said, "I decided to see if I could make this dream of her come true."Sleep eventually agreed to do the routine and the dancers, who were just 5'2, created the choreography to use their eight-inch height difference to their advantage in a humorous way."

The dance instructor also pointed out that "the rehearsal we had took place not at Kensington Palace, as shown in the Netflix crown, but at a dance studio we had been working out since 1981."

The night of 1985/12/22, Princess Diana joined her husband in the Royal Box to perform various performances, but at one point she slipped down. In the Netflix drama, Charles stood up and loudly applauded the opera number, sat down and watched Wayne's sleep take to the stage.

Alan said that in real life, the "very hyper" Diana disappeared into the king's smoking room, where she was "pacing and eating at a voracious rate from the table, but it was covered in goodies."The princess then joined the Sleep when "Uptown Girl" began to play, and when she realized that it was the Princess of Wales, just like the Netflix show, watched

in the Netflix version of the performance, Charles stayed in his seat and watched the rest of the crowd jump to his feet. I'm clapping awkwardly while I'm out. And while Charles and Diana were riding home from the event, he tells her it was "a grotesque and distressing exhibit.""We'll probably never know what he really said, but Alan wrote that the future king's reaction in real life was similar.

Alan wrote that he could "feel" that Diana "desperately wanted his approval" at the reception after the dance performance. But Charles simply "began to talk to someone else, saying 'well done darling'," Alan wrote.

On May 1, when they returned to lessons for the first time after the holiday, the dance instructor wrote that Diana flashed a "naughty smile" and "admitted that Charles did not think it was appropriate to dance in public."

However, Alan said behind the scenes after Diana completed the dance, "Won the wedding!"”