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The explosive claim was made by Earl Charles Spencer in his upcoming memoir

King Charles told Princess Diana that he did not love her on the eve of their wedding, Earl Charles Spencer's shocking memoir has claimed.

Diana's brother's upcoming book, Swan Song: Diana, My Sister, has caused a major stir in royal circles with significant allegations about the King.

It was revealed the memoir claims King Charles, just days after Diana's death, told her brother: "Rest assured, we'll forget her soon enough."

However, Earl Spencer made another shock claim about the couple's wedding.

On the eve of their wedding, which took place on July 29, 1981, Earl Spencer alleged then-Prince Charles told his fiancée, in no uncertain terms, his true feelings.

"Her husband-­to-­be had told her the previous day that she needed to know he was very happy to marry her, but he was not actually in love with her," he claims in the bombshell book, which is being serialised in the Daily Mail.

"Diana had to absorb that hammer blow while also feeling certain that Prince Charles was entering their marriage with his heart elsewhere."

The Earl also says "things became very difficult early on" in the marriage, with the couple engaging in therapy and expert support which was on offer.

The Earl has also alleged the King was left "giddy and elated" upon hearing of the death of Diana, even claiming the then-Prince of Wales sounded "like a lottery winner" when they shared a phone call that evening.

"It all sounded strangely matter-of-fact, given the enormity of the disaster," Earl Spencer wrote, after noting that Princes William and Harry had already been made aware of their mother's death.

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Earl Spencer says his decision to break his near three-decade silence and release this shocking memoir is down to the constant flood of interview requests about his sister.

"This has convinced me to write down my own thoughts and memories, once and for all, rather than having the discomfort of again reading the opinions of others, many of which are based on untruths that have become accepted over time," he stated previously.

Last night, following the memoir's first revelations about the King, Buckingham Palace issued a rare statement.

A spokesman told GB News: "While we do not comment on books as a matter of principle, His Majesty is mindful that the pain of fraternal grief can cloud reason, affect judgment and colour memory in ways others do not recognise, even many years after such a loss."

The book recently faced a setback after multiple copies were stolen in a lorry robbery in the Netherlands.

Four copies of the memoir, concealed in black plastic wrapping to protect their contents, were taken from the vehicle after it had been left overnight during its journey from a Central European printing facility to a distribution warehouse.

Swan Song: Diana, My Sister, comes to stores in the UK on Tuesday, September 22.

Buckingham Palace refused to comment further when approached by GB News.