Jack Nicholson’s alleged penchant for prostitutes has been outed in Debra Winger's new autobiography Undiscovered.

Winger co-starred alongside the aging playboy on the big screen in the 1983 Oscar-winner Terms of Endearment.

And among her own intimate revelations, the actress recalls a shocking encounter with Nicholson after the pair landed in Germany to promote the movie.

She writes, "I had never been there (to Germany) and was relentlessly joking with Jack (Nicholson) about how I, as a Jew, would be treated.

“He finally told me to stop, that these paranoid fantasies had little to do with modern Germany and that I should relax and enjoy the trip - and perhaps join him on his search for the perfect brothel."

Winger's book - her first – hits stores in June.