Charlotte Church has vowed to clean up her sleazy image - for her grandmother.She revealed: "I do try to control my behaviour."Only because my poor nana gets so upset with all the drunken photos.Otherwise I don't care. "Meanwhile, Charlotte is worried her drink binges has stunted her liver.But the Welsh warbler said although she is worried about her health and making a fool of herself she can't stop going out and enjoying herself.She added in an interview with Britain's Observer Music Monthly magazine: "I think I drink too much for health reasons My poor liver!

It hasn't even developed yet! But everyone does it at my age If I can't do it now, when can I do it?".

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