So Cheryl's back. Simon's back. Louis, well, he'll probably be back. So the question on

everyone's lips is who will take fourth seat on The X Factor judging panel? Well, we're

here in central London for the launch of the X Factor musical I Can't Sing! to find out just that.

I think Rihanna would absolutely smash it apart, but it's whether she's got the time

to do it or not. If she has, fantastic.

If I was booking it, I'd put like a rock star in that seat, just to give it a totally different

angle. Like Cheryl came through Pop Stars. You know, Simon and Louis are obviously managers.

To have someone that's come and built a band from a practice room to an arena or stadium,

I think that would be such an interesting perspective to have on the show.

-We should do a week each, should we? -That'd be good.

A rotation for Union J.

Guest judges. I can see that.

I would like to see Rihanna on there. That would be really cool. I don't know. Anyone.

Beyonce. Imagine? Imagine Beyonce on there. Imagine what she'd be wearing.

Ollie would be good. Ollie would be really good. Ollie would be good because it'd be

a real like sort of the show would eat itself in a way. Someone who's been through everything,

and it shows they can now be a judge. Ollie would be a great judge. He works very hard.

So the celebs had their say, but boss Simon Cowell wasn't giving anything away. However,

he said he's more than happy to have our favourite Geordie back on the panel.

Simon, obviously Cheryl's back. We're so happy. How did you do it? What did you do?

I charmed her.

Was there anything in particular that made her change her mind?

You know why she came back? When we had a conversation at my house and we were talking

about the talent in that final year, 2010 - One Direction, Rebecca Ferguson, Cher Lloyd,

Matt Cardle - we just had great people. And we just suddenly thought 'we want to do the

same thing all over again.' And that was the incentive to do it - the belief that there

are still great people in this country left.

So who will take that last remaining seat of the judging panel? Well, we'll just have

to wait and see.