Lily Allen has had her version of Womanizer "leaked" by Mark Ronson, and her record label "aren't happy" about it.

She posted on her blog: "Now, some of you may be wondering why I covered Womanizer. Simple really; I love Britney and I love the song (I'm also struggling dearly to write my own stuff, hence why my second album has yet to materialise). It wasn't my intention for it to have whizzed round the world like it has ('cause that's the WORST kind've marketing). Mark Ronson asked me for something no one had heard to play on his radio show and Womanizer was the only song I had as an attachment on my Blackberry (weird that) and I couldn't get home to send him anything else in time (etc, etc... etc. No keys and no one to let me in, that kind've thing ). I had asked him to talk all over it so it wouldn't get ripped, but he didn't - thanks Mark for getting me in serious trouble with my record company" (and loads of free PR for something I'd to put little effort into. No, really. Thanks a bunch).