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Channing Tatum
and Rooney Mara star in the upcoming thriller "Side Effects" -- and the winner of this week's giveaway will get one pretty exciting prize.

To celebrate the movie's release, we'll be giving away one poster autographed by the cast!

The winner will receive a poster signed by Tatum, Mara, Jude Law, Vinessa Shaw and Dr. Sasha Bardey.

"Side Effects" is a thriller about Emily and Martin (Rooney Mara and Channing Tatum), a successful New York couple whose world unravels when a new drug prescribed by Emily's psychiatrist (Jude Law) – intended to treat anxiety – has unexpected side effects.

Simply fill out the form below for your chance to win!

Click here for the official rules

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