We felt the time was right to open up the boundaries, and say to all of America, regardless of your age, whether you're 2, whether you're 100, regardless of what you believe your talent is - juggling, magic, singing - this is the show you can enter. It's as simple as that.

I love producing shows. And so when you're on a show where other people are making decisions you don't necessarily agree with it, after a while you start to feel like a passenger.

I think of stress as the creator of cancer and heart attacks, like a tiny little ball you feed. I believe that one of the reasons I've never got ill is that I'm not stressed.

I don't want to tell a 15 or 14 year old what they should be doing. I want them to tell me. And that's what I got when I met Justin Bieber for the first time.

I was so tired, wasn't having fun any more, and wasn't sure if I wanted to do this any longer. So I turned my phone off and sorted my head out. It was the opposite of a breakdown really, it was a break-up - I got rid of all the idiots, realised my job was supposed to be fun, and got on with my life.

Maybe I am a bit mad.

It was like orderin a hamburger and getting only the buns