Madonna's daughter wants to dye her hair blue - much to her mother's fury.

Lourdes, 14, is keen to change her raven locks to a brighter colour but the fashion-conscious teenager admits her superstar mum isn't impressed with her plans.

Writing on her blog, Lourdes said: "I don't know if any of you saw my hair yet but its mad dark right at the moment. I'm almost sick of it and now I want royal blue hair but not a streak, like my entire head. I'm sure if I get that hair color I'll be sick of it after about two weeks. "I read this blog aloud to my mother and she is sitting here staring at me with no expression on her face, as if she doesn't approve of it! So now you all know what I have had to put up with for the past 14 years of my life :D. (sic)"

This is not the first time Lourdes and Madonna have clashed over their opinions as they recently launched teen clothing range Material Girl together and the 'Celebration' hitmaker admitted they didn't always see eye-to-eye.

She said: "I think we complement each other but we do disagree on a few things. I wouldn't have worn this flannel shirt thing but she looks good in it so what are you going to do. I'm a very proud mum tonight."

Lourdes added: "Yes there were definitely clashes but you know it all worked out in the end."