Prince William has succeeded Charles as the Prince of Wales.
It comes after Charles became King upon the death of his mother Queen Elizabeth II yesterday.
READ MORE: King Charles III takes the throne, after a lifetime of preparation
In his first public address as King, Charles said he was "proud" to hand over the title.
"With Catherine beside him, our new Prince and Princess of Wales will continue to inspire and lead our national conversations," he said.
Prince William will also assume the title of Duke of Cornwall.
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His wife, Catherine, will become the Princess of Wales and Duchess of Cornwall.
King Charles had been the Prince of Wales for more than five decades.
"Today, I am proud to create him, Prince of Wales – Tywysog Cymru, the country whose title I have been so greatly privileged to bear, during so much of my life and duty," the King said.
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