Simon Cowell wants to start a family, but only if he can stay faithful.

The music mogul has admitted he doesn't know if he'd be a good father ''for the first six months'' but he would do well providing he didn't cheat on the mother.

He told the Sunday Mirror newspaper: ''Would I like kids? If I knew I could be, and how could I put this delicately, faithful, then yes. I do like kids.

''I'm not sure I would be a good dad for the first six months or so but once they know who I am, I would like it. I definitely haven't ruled out having children.''

The 53-year-old star - who revealed he wants a daughter - also refused to ''completely rule out'' adoption but explained he'd rather start his own family.

He said: ''I think I'd rather have my own but then again I wouldn't completely rule out adopting either.

''If I did have a child, I have to say I'd prefer a girl.''

And according to The Sun on Sunday newspaper, his fellow 'Britain's Got Talent' judge Amanda Holden has said he will be a ''fun'' father, even if he couldn't deal with every aspect of parenthood.

She added: ''He is so good with children. I want him to have children because he would genuinely be a fantastic dad because he is good fun.

''But there is no way he would go near a nappy or a poo or anything like that. When the baby's walking and could have a conversation with him and know who he is, that would be fine.''