On big screen Blake Lively going to "Town"

"Gossip Girl" star Blake Lively has joined the ensemble cast that Ben Affleck is assembling for "The Town," a crime thriller he's directing.

In addition, Chris Cooper is in negotiations to board the Warner Bros. movie.

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Affleck, Jon Hamm, Rebecca Hall and Jeremy Renner already are cast in "Town," an adaptation of Chuck Hogan's novel "Prince of Thieves."

The story follows a bank manager (Hall), the career criminal (Affleck) who stole more than her

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heart and the dedicated FBI agent (Hamm) trying to bust the crook and his gang, of which Renner is a part.

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Lively is playing Renner's sister and Affleck's troubled ex-girlfriend. Cooper would play Affleck's father.

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Lively returns as Serena van der Woodsen on the CW's "Gossip." whose new season begins September 14. She also will be seen on the big screen in "New York, I Love You."

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Cooper, who won an Academy Award for "Adaptation," also appears in "New York" and the upcoming drama "The Company Men," which stars Affleck.