The Shout hitmaker began a brief romance with the rocker in 1974, when she was 26 years old, and she has now revealed he encouraged her to shift the pounds in a bid to improve her image.
She tells Britain's Event magazine, "I had a small window when I was involved with Bowie... We were so connected because of the music, it was the personal stuff that was... odd. Some of the conversations we had were insane.
"He told me I should lose weight. I was a bit embarrassed because I was always a little chubster (sic), but he was talking in terms of my image - that was the thing then, that heroin chic look. He didn't say it when I was in a compromising situation with him."