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 honestly can't ever imagine retiring because I don't know what else I would do - even when I'm on holiday, 70% of the time I'm working. I think I'd like to go out on the job so, ideally, 'And the winner is... Ooooh, and he's gone!'

At 20, you're cocky and you think you can rule the world, and you get it all wrong.

I'm obsessed with cleanliness for myself, so I will take a bath three times a day, sometimes a steam twice a day in addition to that.

If I went to a psychiatrist, it would be a long session. I've always thought that I do have a number of issues that probably need dealing with, because I am quite odd in some ways.

The object of this competition is not to be mean to the losers but to find a winner. The process makes you mean because you get frustrated. Kids turn up unrehearsed, wearing the wrong clothes, singing out of tune and you can either say, "Good job" and patronize them or tell them the truth, and sometimes the truth is perceived as mean.

One thing I've learnt is you should never fight it. They're natural emotions and when you try and bottle everything up, that's what can make you depressed. Luckily I have fantastic memories [about my parents] and they really help.