The birthday party promises something very special, with the likes of Prince William, Kate Middleton, Prince Harry and Meghan Markle among the first names on the guest list of hundreds of people joining the celebrations.
In September it was revealed that the Queen, who will give a speech at the party, has already started sending invitations.
But the invitations do not stop at the British royal family – with kings, queens, princes and princesses from all over the continent who will join the celebrations.
According to Royal Central, Crown Princess Mary and Crown Prince Frederik will be present on behalf of the royal family of the country, while Norwegian Queen Sonja and King Harold may also travel to the United Kingdom.
The royal court of Serbia suggested that his royal family received an invitation, but did not reveal whether they will participate.
The Spanish royal family has not yet published the agenda of the activities of King Felipe VI and Queen Letizia for the next week.
The Dutch royals were recently in London for an official state visit, but Queen Máxima was forced to cancel a series of imminent commitments due to suspected intestinal infection.
The huge celebration will see the hundreds of guests enjoying a reception followed by a sumptuous reception, possibly in the luxurious halls of the Palace. But Sarah Ferguson, who has a chess past with Prince Charles, will be among them?
The Duchess of York secured only one day of invitations to the wedding of Prince Harry and Meghan Markle in May and was completely snubbed by the great day of Prince William and Kate Middleton in 2011 – instead of escaping from the country to spend a little 39; of time in a spa in Thailand.
He had a well-publicized chess story with Prince Charles for more than 25 years, after being included in the royal family list when, in August 1992, images of her emerged with the Texas millionaire John Bryan.
Will Sarah Ferguson be invited to Prince Charles's birthday party at Buckingham Palace?
The huge embarrassment came only five months after she and Prince Andrew announced their separation after nearly six years of marriage and the royal family and Fergie realized the scandal when they opened the morning papers at the breakfast table at Balmoral. .
Despite this, Andrew and the Duchess still live together, but the recent Netflix documentary "The Royal House of Windsor" revealed that their close relationship "really annoys" Prince Charles.
Speaking to the documentary, Vanity Fair's real correspondent, Kate Nicholl, said: "Andrew was an obligation to the royal family.
"His relationship with his ex-wife Sarah Ferguson is one of the things, I've been told, that really annoys Charles.
"Everything contributes to something that is not very palatable."
The relationship between Prince Charles and Prince Andrew was also particularly fractured over the years, with Charles snubbing his brother during the celebrations of the Queen's Diamond Jubilee in 2012, when the royal family appeared on Buckingham Palace's balcony.
Sarah Ferguson seemed to be on good terms at Princess Eugenia's wedding
Charles appeared beside the Queen, Prince Philip, Prince William, Prince Harry, Camilla Parker Bowles, and Kate, the Duchess of Cambridge.
Basically, Prince Andrew and his daughters, Princess Eugenia and Princess Beatrice, were excluded – unleashing the fury of the Duke of York – while Charles attempted to present a new monarchy of the future.
But it is not just Charles with whom Sarah Ferguson has a saccharine relationship: his wife Camilla, Duchess of Cornwall, has snubbed Eugenie's marriage last month amid a long-term feud with Andrew and Sarah, according to explosive royal recalls.
Actual sources even suggested that the real reason for the Duchess's no show was that she would rather host a shooting party at her Scottish home.
His apparent disdain has triggered the speculation of a real rift between senior members of the royal family, at a time when the company, especially the younger members, are riding a wave of popularity.
Clarence House said that Camilla had "previous commitments" to attend a local school harvest festival near her home in Balmoral.
Sarah Ferguson was a "bag of nerves" before her showdown with Prince Philip
Sources close to the family said that Camilla "did not forget" that Prince Andrew was unable to speak while she and Charles fought with the public acceptance report after Princess Diana's death.
Even Camilla and Sarah Ferguson never saw eyes while the Duchess of York was a close friend of Princess Diana.
A real assistant told the Daily Mail: "Camilla always thought that Andrew could do more.
"The Queen listens to Andrew and may have helped her brother at a time when she had few allies in the family.
"In fact, I would go so far as to say that it was profoundly useless when the support would have meant a huge amount for you and the Prince.
"Looking back to when there was little public sympathy for Charles and Camilla, if not for open hostility, it was the case of Andrew who was politics." Camilla has not forgotten. "
Sarah Ferguson seemed to be on good terms with the Queen at the Royal Ascot in July
At Eugenia's wedding, Fergie's relationship with Prince Philip – who said he was so enraged following the pictures 'bloodsuckers' that she could not be in the same room as her – she showed signs of reparation, after the Duke of Edinburgh sat directly behind her at St George's Chapel during the ceremony.
The Duchess of York seemed to emit a huge sigh of relief in a sign that their feud for almost three decades was about to end.
A body language expert said that Philip "took a big step" towards reconciliation with Fergie, after showing a warm welcome to his former daughter-in-law, approaching her with a smile and the couple also posing in family photos.
In view of the big day, a friend of the Duchess of York revealed that it was a "bag of nerves" on her showdown with the Duke, but despite the tension that was believed to exist, there seemed to be very few grudges among them.
Judi James, who specialized in social behavior, said: "He smiled at least twice, almost as if he had planned to greet her warmly.
"It was a big step for the Duke of Edinburgh".
Fergie also seems to have patched up her relationship with the Queen after receiving an invitation to receive the monarch's champagne after Eugenie's marriage.
On the eve of Eugenie's wedding in Windsor, the Duchess of York also spent the third consecutive summer on holiday in the residence of the Queen of Balmoral, right where she was when news of the toe scandal broke out.
She was also invited to the Royal Ascot this year, where she took her place with pride on the Queen's observation desk.
But a question mark hangs on Fergie's invitation to Charles's 70-year-old party.
Buckingham Palace told Express.co.uk that they do not share the details of guest lists for real events.