A listener asked Christie on a radio call-in show Monday if there are any plans to make sure the prince behaves.
Christie says he'll be with Harry the entire time and that Queen Elizabeth II knows she can trust her grandson with the governor of New Jersey.
On his last U.S. visit, the third-in-line to the British throne was caught frolicking in the nude with a woman in Las Vegas after an alleged game of strip billiards. The governor says lots of young people make mistakes.
Christie, speaking on TownSquare Media's "Ask the Governor" program, says he's thrilled the prince wants to see the damage caused by Superstorm Sandy and be helpful.