Keira Knightley is doing what Rihanna should do.

Taking a firm and public stand against violence toward women.

The award-winning British actress is shown being brutally attacked by her boyfriend in a disturbing new anti-domestic violence video for Women's Aid.

The two-minute clip opens with the actress heading home from a long day of filming. When she arrives home, her boyfriend verbally and physically attacks her, accusing her of having an affair with a costar.

But be warned. It looks real.

Knightley lays on the floor as the beating continues, and when the camera pans out, you see an empty film set.

"Isn't it time someone called cut?" the ad says. The video will air on April 6 in movie theaters.

Knightley volunteered to star in her "Atonement" director Joe Wright's video  because "while domestic violence exists in every section of society we rarely hear about it. Domestic violence affects one in four women at some point in their lifetime and kills two women every week."

Right on, Keira.

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Posted by:Elizabeth Snead