The 'Foundations' singer - whose own songs often include swear words - dislikes the American girl group because she believes their band name and raunchy lyrics are inappropriate for their young fan base.
She said: "They do sexualise young children, it's a fact - look at their name 'pussy' and 'dolls'. But even though I say f**k and **** and cocaine in 'Mansion Song', there's nothing in there as offensive as 'Don't you wish your girlfriend was hot like me?' "
Even though she swears regularly herself, Kate is adamant children won't be offended by her music.
She explained: "I'm sympathetic - if people don't want their kids to hear it, they're offended by it, I accept responsibility. But I'm not going to censor myself. I'm not a TV presenter, I'm an artist.
"It's unfortunate really that I became a pop star, because that was accidental. I didn't mean to do that. So I apologise to parents who think that I'm going to offend their children. But I actually think, you know what, your children won't be offended."
Instead, the 22-year-old singer hopes her young fans will find her LP 'My Best Friend is You' empowering.
She said in an interview with The Times newspaper: "They'll come away from it not singing about stealing people's boyfriends. They're going to be singing about wanting to be an empowered woman with f***ing morals and brains and not thinking, 'I wanna be pretty, I wanna be thin, I wanna s**g people.' They're gonna be thinking, 'I wanna f***ing do something.' That's much better in my book."