PRINCE William will pay tribute to both the King and Camilla after a glittering Coronation concert at Windsor Castle.
A source said his speech will be "heartfelt and loving".
William's support for his stepmother is in stark contrast to brother Harry, who criticised Camilla in his recent book, Spare.
After a musical extravaganza featuring rock royalty, William will make his moving speech.
He is putting the finishing touches to Sunday's concert address and the royal source confirmed William clashes with his brother on the matter of Camilla. In Spare, Harry said he feared the Queen Consort would become their "wicked stepmother" and accused her of leaking stories to boost her image.
The source said: "William feels entirely differently to his brother on these matters.
"His will be heartfelt and loving, F paying tribute to his father as a man of principle who has also devoted himself to duty and causes he believes in.
"The prince also feels it is important to pay tribute to how Camilla has dedicated herself to causes and has made a real difference to many in her royal role and also contributing to his father's happiness." Harry has already told his dad he will not hang around for the Bank Holiday weekend of celebrations.
He will return to the US to belatedly mark the fourth birthday of his and Meghan's son Archie, which is on the same day.
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