Simon Cowell's lavish lifestyle has been revealed in a new unauthorised biography.

According to the book 'Sweet Revenge: The Intimate Life Of Simon Cowell', which has been serialised by The Sun, the music mogul has Botox twice a year, intravenous vitamin injections and regularly has colonic irrigation.

Simon is also said to refuse to have regular white toilet rolls in his luxury Beverly Hills mansion, and insists on using black toilet paper.

The book - written by journalist Tom Bower - also claims the 'x factor' boss has a special feature in his $31 million house that makes it look as though he is walking on water.

Earlier this week, revelations emerged from the unauthorised biography claiming Simon had a secret affair with his former 'X Factor' colleague Dannii Minogue when she first joined the show in 2007.

Simon has taken to twitter to insist the book has not been written by him, but he has not denied that he took part in its preparation.

He wrote: ''This book is not written by me. It is unauthorised. The writer is Tom Bower.''