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.
Now it's launching a massive project to build the biggest children's cancer treatment centre in Europe and Prince William is behind them all the way.
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.
In 2005, he did work experience at the children's cancer unit and said he'd learnt a lot since then.
"I've learnt so much and met so many incredible people who have been unfortunate enough to have cancer, and most battle through it and have dealt with it in an incredibly inspirational way," he said.
Harry Potter scar
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.
"I got hit by a golf club when I was playing golf with a friend of mine. We were on a putting green and the next thing you know there was a seven iron and it came out of nowhere and hit me in the head."
Prince William is flying helicopters now, but he used to want to be a policeman
Prince William also revealed how he'd wanted to be a policeman when he was younger, but soon realised that probably wasn't a good idea and now he's happy flying helicopters instead.
"It's going very well," he said. "My instructors would probably say not so well, but I think it's going not too badly.
"I haven't managed to dent any of the aircrafts and I haven't flown into any trees yet so it's going OK."
But could he beat his brother, Prince Harry, in an arm-wrestling match?
"You know the answer to that!" he said. "It's not even a contest. Obviously I'd win. Obviously!
"As the bigger brother you have that psychological power over your brother you see."