Basic Instinct actress Sharon Stone beat her young co-star until his nose bled.

The actress plays a character in her new film 'Alpha Teen', based on the mother of murdered teen Nicolas Markowitz.

She felt she �owed� it to his mother to attack the on screen murderer of Markowitz in his memory.

Stone and her young co star Ben Foster discussed the scene before filming and both parties agreed that Stone couldn�t just pretend to hit the on screen offender.

The actress said, � I was trying to hit him as not to hurt him but (the role) required me to really go for him�..it was so awful and his nose began to bleed�.