Sinitta Plans Revealing Memoir About Simon Cowell

They had a tumultuous on-again-off-again relationship for more than two decades.

And now Simon Cowell's former pop-star girlfriend, , has revealed she is writing a 'tell-all' book about her life and their relationship.

Speaking to the Daily Mail at the Rainbow Honours, the So Macho star, 62, said: 'There is a whole load of stuff that people don't have any idea about.'

She joked: 'Simon will be happy. So long as it's about how handsome and charming and brilliant he is, he'll love it, but it'll be a book about me, not Simon.'

Sinitta said that those referenced in her memoir titled, Who Put the Sin in Sinitta, will not get advanced warning and said: 'I won't tell people what I'm going to put in the book.'

The Toy Boy singer and the music mogul, 66, embarked on their on-again-off-again relationship in the 1980s when she signed with Cowell's former label, Fanfare Records.

She later said there was 'always an element of' the romance 'never being over' despite both of them dating other people across the decades they knew one another.

In 2002, Sinitta ; however, during an appearance on the Suddenly Single podcast, she revealed: 'The man that I married was actually a lovely person.

'It was a bit of a revenge move at the time, but it developed into something. But even during that relationship, it was obvious that there was unfinished business [with Simon].

'It would be, 'Well, if he's done that, then I'll date Brad Pitt, I'll date this model.' But always intentionally thinking we will be together when we stop being crazy.'

The So Macho singer, who dated the actor between 1986 to 1988, added: 'Because I would have been ready to go at any time, but it was like my pride needed me to go and have a retaliation relationship to show I'm not desperate.'

But the romantic side of their relationship officially came to an end when Cowell Sinitta the now 12-year-old's godmother.