Meghzan Hussainy getting back at ex Simon Cowell

London: Music mogul Simon Cowell`s ex-fiancee Mezhgan Hussainy is reportedly writing a tell-all book. Hussainy apparently wants to get back at Cowell after he called his relationship with her "a big mistake" in a biography written by journalist Tom Bower.

The book will documents 39-year-old`s journey from Afghanistan to Hollywood, a website has reported.

But most importantly is will give an account on what it was like dating Cowell and living in his mansion as well as revealing the arguments that led to her split with the 52-year-old `X Factor` boss last year.

"Mezhgan was very hurt by some comments in the biography, particularly a quote from Simon`s mum Julie that said Mezhgan made her stomach churn. She was embarrassed, feeling she`d been made to look a fool, and she plans to put her side across, which is likely to leave Simon squirming," a source said.