WHATS THIS MOVIE CALLED?? (starring Bruce Willis)?

Ok, so I remember its about a girl and she lived in a super rich house. And it started with these guys hitting on her and she blew them off so they followed her (in a car) to her house and this guy who was in the car was a maniac or something, and wanted to kill her and how she killed him in the end? Im sorry about the wierd discription, but thats all I remember. And I also remember Bruce saving her or trying to save her or soemthing like that