The latest British tell-all on the life of the late Princess Diana claims she associated with cocaine users and once tried it herself with terrible results.

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Alternative therapist Simone Simmons, 49, alleges in her second behind-the-scenes book, "Diana: The Last Word," an unidentified former boyfriend who was a habitual cocaine user talked her into snorting up once.

"It made her feel so ill. It made her feel sick, dizzy and breathless," the book says. "She felt she was going to have a heart attack and die when she tried cocaine."

Simmons also claims Diana had been trying to wean Dodi Fayed off cocaine in the weeks before their deaths in a Paris car crash, and said their relationship was not romantic, but rather platonic.

But the most derision over her latest book has come from claims Diana had an affair with John F. Kennedy Jr., the Daily Mail reported.

"It has also been suggested that she may have made the claims because profits from her last missive are dwindling and she needs the money," the newspaper wrote.