Keira Knightley Stars in Disturbing PSA

Ever since the whole Chris Brown/Rihanna thing happened, domestic violence awareness has skyrocketed. The latest star to get in on the do-gooding is Keira Knightley -- who has filmed a pretty violent PSA for the charity Women's Aid.

The 2-minute spot will begin showing in movie theaters on April 6, and was directed by Atonement's Joe Wright.

Keira said she wanted to star in this piece 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."

Check it out.