Hussainy and the X Factor judge were together for two years before splitting in February.
Reports earlier emerged claiming that the make-up artist had plans to write a memoir about her life with the music mogul, after comments in Tom Bower's book Sweet Revenge: The Intimate Life of Simon Cowell cast her in a bad light.
However, Hussainy has said that she has no such plans for a tell-all, according to TMZ.
Sources close to Hussainy say that she is "not the type of person" to write a scathing memoir, and that she and Cowell are still close despite their break-up.
A representative for Hussainy also confirmed that she "has absolutely no plans to write a book of any sort".