From children's BBC TV Newsround programme:
Last Updated: Wednesday March 18 2009 13:03 GMT
It's not everyday you get to meet a future king of the United Kingdom, but Press Packers Alice and Oscar have done just that.
The pair were invited to Prince William's home, Clarence House, where they quizzed him about all sorts of stuff, including his charity work, what he'd do if he were invisible for a day and how he got his own Harry Potter scar.
Prince William is the president of the Royal Marsden Hospital, which treats children who have cancer and where both Alice, 10, and Oscar, 12, have been patients.
When Alice asked him why, the prince said his mum had been closely involved with the hospital when she was alive and he wanted to follow in her footsteps by doing what he could to help.
After chatting about the campaign, Alice asked the prince about an operation he'd had when he was nine, which he said left him with a "Harry Potter scar" on his forehead.
"I call it that because it glows sometimes and some people notice it - other times they don't notice it at all," he said.