The royal attended the WellChild Awards in London as part of his role as Patron of the charity, which supports terminally and critically ill children in the UK.
Harry lightheartedly wagged his finger at 6-year-old Alex Logan, who had earlier promised on ITV News that he'd say, "I'm glad you've got your clothes on Prince Harry!" upon meeting him.
Harry joked with him: "You keep looking up at your mum. It looks like you're dying to say something but you're worried she'll tell you off.
"I heard you were on ITV earlier and you said something cheeky but let's not talk about that here."
Sources claimed that the Prince was worried the scandal would overshadow the charitable cause.
Harry was recently said to be "furious" over claims made by a woman who alleges that she joined in his game of 'strip billiards'.
Watch Prince Harry talk to Alex Logan below:
Photo gallery - Prince Harry's antics:
Copyright: Rex Features Paul Grover/Rex Features