Dr Steven Hoefflin has claimed that the inspiration behind late King of Pop"s 1983 single was a beautiful female fan he spotted outside his family home.
The singer was in a car with two of his brothers when he wrote it. Later, Jackson sketched her in nude form and gave the pic as a gift to his cosmetic surgeon pal.
"The fastest song he ever wrote was Billie Jean," the Sun quoted Hoefflin as saying. "He said the lyrics just tumbled out of his head in one continuous, rapid stream," he added.
In his autobiography Moon Walk, Jacko wrote: "Billie Jean is a composite of people my brothers have been plagued with."