The 69-year-old singer took to Instagram to praise the prince.
"Bravo Prince Harry! Your mother would be so proud of you," he wrote.
Prince Harry underwent a HIV test which was broadcast live to the world through social networking site Faceboook.
John further went on writing, "In 1991, Princess Diana moved a mountain by addressing the stigma surrounding people living with HIV/AIDS. She showed the world we could safely wrap our arms around AIDS patients, by shaking hands with a patient without gloves."
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