Well, you know a lot about girls who can not sing ... but have you seen the video? Seriously, I'm not a fan of Nicole and Pussy Cat Dolls, but she can sing and she sang well complicated opera parts.
I remember seeing this when it first aired and I stand by what I say.
This woman is not an an artist, a singer, a performer. She is famous solely because of her looks.
Perhaps she was on tune in this, I honestly can't remember - though I highly doubt it - and I don't want to put myself through the misery of watching this.
My sister has seen her in concert live - as part of the pussy cat dolls - and she left early, stating that they were all completely off tune and that none of them could sing - and trust me, she has a fairly high tolerance for talentless trash.
I've seen some of her performances on TV, she has a horrible tone and is rarely in tune. Her personality is also insufferable - particularly on UK x factor.
[Edited 6/19/13 15:41pm]
you really have no idea what you're talking about. She is well-trained, has a theatre and performing arts background, can sing a range of genres and has a great voice. You're not going to find too many pop/r&b singers who can do opera too.