Kelly Clarkson has slammed Clive Davis for ''spreading false information'' about her in his memoir.

The 'Stronger' hitmaker hit back at her former record label boss - who she claims experienced ''memory lapses'' while writing his tell-all autobiography, 'The Soundtrack to My Life' - revealing he made her cry and called her a ''s****y writer'' because he didn't like her hit song, 'Because of You'.

Explaining in a blog on her WhoSay page, she wrote: ''First, he says I burst into 'hysterical sobbing' in his office when he demanded 'Since You Been Gone' be on my album. Not true at all. His stories and songs are mixed up.

''But, yes, I did cry in his office once. I cried after I played him a song I had written about my life called 'Because Of You.' I cried because he hated it and told me verbatim that I was a 's**tty writer who should be grateful for the gifts that he bestows upon me.'

''He continued on about how the song didn't rhyme and how I should just shut up and sing. This was devastating coming from a man who I, as a young girl, considered a musical hero and was so honoured to work with.''

The 30-year-old singer also claimed Clive, 31, publicly badmouthed her 2007 album 'My December' and refused to promote it.

She said: ''He also goes on to say 'My December' wasn't successful because I co-penned the album and it didn't have 'pop hits'.

''He doesn't mention how he stood up in front of his company at a convention and belittled me and my music and completely sabotaged the entire project. It never had a chance to reach its full potential.''

Music legend Clive, 81, is credited with discovering the late Whitney Houston and has also worked with the likes of Alicia Keys, Jennifer Hudson and Leona Lewis.