The former opera star admits she is embarrassed by her 2005 album 'Tissues and Issues' and was left ''heartbroken'' by the pop direction her record label pushed her in.
She said: ''I workshopped some ideas with Gary. The results were pretty depressing really.
''With 'Tissues and Issues' I was disappointed while I was making the sodding thing. I was 18 and, really, still a baby.
2sony sent me to work with all kinds of people. A songwriter played me 'Crazy Chick' which I f***ing hated. But he sent it to the record company too.
''They said, 'It's sooo you, Charlotte', insisted it would be a massive hit and made me record it. And then when I delivered the rest of the album, the A&R said, 'It's alright, I suppose.' I was heartbroken.''
Charlotte has now launched a career as a rock musician and has vowed not to sing her most famous pop or opera hits ever again.
She added to Q magazine: '''Crazy Chick' is the song I despise most, because it was written to exploit the tabloid caricature I had become. That song and 'Pie Jesu' will never pass my lips again.''