It’s Charles Vs Charles.

A vicious duel between Britain’s King Charles and Princess Diana’s brother has emerged over the scathing contents of memoir “Swan Song: Diana, My Sister,” ahead of its publication next week.

British Earl Charles Spencer, 62, has unleashed a series of unprecedented broadsides against the UK monarch, calling the 77-year-old king a “bellowing buffoon” while accusing his ex-brother-in law of proclaiming, “Rest assured…we’ll forget her soon enough!” immediately following Diana’s death in a Paris car wreck in August 1997.

Buckingham Palace has already issued a remarkable statement after Spencer also claimed Charles sounded…

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