The Prince and Princess of Wales have shared a public message to King Charles .

In honour of the monarch's 78th birthday, the future King and Queen took to their joint Instagram account to celebrate His Majesty.

"Wishing a very Happy Birthday to His Majesty The King!" the couple penned, sharing the message alongside a recent photo of Charles and Elton John.

The image was taken of the duo as they joined forces to record an hour-long special episode of Sir Elton's Apple Radio show Rocket Hour , which will air this evening in honour of Charles' birthday.

The top-secret recording took place last month, when both men visited Apple Music Studios at…

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