Hollywood star Bruce Willis enraged a young woman at a swanky New York party last week when he jokingly propositioned her in a less than gentlemanly way.

The 50-year-old "Sin City" star was discussing favourite chat-up lines with pals at the Roosevelt Hotel, and he reportedly asked the woman, "What are your plans for sex tonight?", reports celebrity portal Femalefirst.

Willis' lawyer Marty Singer says, "Bruce was joking around with some friends and talking about pick-up lines. One friend remembered an old pick-up line (Willis) used to use.

"The friend said the line and Bruce may have repeated it, but he was not trying to pick up the woman."