Prince Harry wagged his finger at Alex Logan when he met the witty six-year-old this evening at the Wellchild Awards, a ceremony which honours seriously ill children and their carers.
Earlier today Alex told ITV News he was going to tell the Prince he was "glad he got his clothes on" when he saw him.
Alex appeared poised to broach the topic when the two met at the awards ceremony this evening. But Prince Harry made it clear discussions about this naked Las Vegas escapades were off limits.
Alex's mum Debbie described the meeting:
Harry said to Alex 'you keep looking up at your mum, looks like your dying to say something but you know she will tell you off.
I heard you were on ITV earlier, you said something cheeky, let's not talk about that here'.
Harry's appearance at the WellChild awards ceremony, at the InterContinental Park Lane hotel in central London, was his first since the naked images first appeared on the web.
He looked relaxed, joking and laughing with the seriously ill award-winning youngsters including Alex, in remission from acute leukaemia, who at one point put his soft-toy penguin on the Prince's forehead.
Harry is patron of WellChild, a UK charity dedicated to the needs of sick children and their families, whose children's nurses provide specialist medical care and direct support in the home for chronically ill youngsters.
The Prince presented awards to ten young winners and said the work of the charity "made everyday worries seem very insignificant" and that he was humbled to be there. Royal Correspondent Tim Ewart reports: