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Harry also joked with host Katie Couric that Prince Charles' mother hadn't even requested his friendship on social networking website Facebook.
He replied to her humorous question: "No she hasn't. Why has she friended you?"
The sons of the late Princess Diana recorded the rare interview on the grounds of Buckingham Palace to mark the Queen's Diamond Jubilee events this year.
The full show is due to air in the United States on May 29 at 9/8c