Prince Harry received a pop star reception with cheers and applause as his girlfriend Cressida Bonas looked on.
Prince Harry proves his timeless appeal by coming second on Tatler's "most wanted" list.
The Queen received a plethora of presents during royal engagements in 2013 including a commemorative Oyster card.
Prince Harry received a pop star reception from young volunteers amid screaming and cheering from fans - but joked that he was sorry for those "who were expecting Harry Styles".
He said: "For those of you expecting Harry Styles, I apologise, and no I am not going to sing."
The prince was a guest at the We Day UK event at north London's Wembley Arena.
He said that Free the Children was a "fantastic" organisation "founded on an inspiring principle - that children have the power to affect change".
Prince Harry has launched a new sporting event for injured British servicemen after being inspired by a similar event in the US.
The prince unveiled the Invictus Games alongside Boris Johnson and Defence Secretary Philip Hammond at the Olympic Park in east London.
Harry has been working to bring the event to the UK after seeing British veterans competing in the Warrior Games in the US last year.
He joked that it was "such a good idea by the Americans that it had to be stolen".
Princes William and Harry have left the flood-hit village of Datchet in Berkshire after a day moving sandbags in a "private" mission to help residents.
Princes William and Harry formed a human chain to unload sandbags from an Army vehicle as they joined colleagues from the armed forces in helping to defend Datchet from the floods.
The private visit was unannounced but once news of their work spread, they were followed by journalists and cameramen.
Asked by ITV News whether he was enjoying helping, Prince Harry replied: "Not really with you guys around".
William and Harry's visit to flood-hit Datchet has "gone down very well", according to the village's parish clerk.
"They were very involved and wanting to know what was going on," parish clerk Graham Leaver said.
"They have been in Datchet and the area and I think it's gone down very well. That is my assessment.
"They were very natural. To be honest, they could have walked in among people here and nobody would have recognised them looking at the way they were dressed.
"They came into our parish office and it took most of us a few minutes to realise they were there. They were particularly interested in talking to the troops."
Princes William and Harry have now left the flood-hit village of Datchet after spending the morning helping to defend the town from the floods.
The royals, dressed in waterproofs and wellington boots, moved sandbags from an Army vehicle onto the back of a train wagon where they were then delivered to homeowners who have struggled to defend their properties.
Asked by ITV News whether he was enjoying helping in flood-hit Datchet, Prince Harry replied: "Not really with you guys around".
The royals were spotted on their "private" mission to help residents by journalists this morning and they have since been followed by reporters and photographers as they continue their visit.
Earlier, Prince William suggested that reporters should "come and help instead of throwing cameras around" after he was pictured loading sandbags in the flood.
Prince William has suggested that reporters gathered in flood-hit Datchet should "come and help instead of throwing cameras around."
The Duke of Cambridge was speaking to ITV News reporter Rupert Evelyn shortly after being pictured alongside his brother Harry helping to move sandbags in the Berkshire village.