During the Duke and Duchess of Cambridge's visit to Singapore, Wills was asked how many children he would like. 'Two', he replied straight away.
He revealed all during a colourful walkabout of the Gardens By The Bay.
Corine Ackermann, 17, who was with schoolfriends from the Tanglin Trust British School, said: "Someone asked him how many children he would like to have, and he said he was thinking about having two."
William recently made clear that he and the Duchess, who are both 30, are keen to start a family soon and many predict that may come after this current tour is over.
He and Kate were also asked what 'powers they would like' if they could be a superhero.
The Duke replied: "That's a hard question – I'm not sure. I'll have to think about it. I think invisibility."