Actors Rooney Mara, left, Casey Affleck, and Ben Foster attend the "Ain’t Them Bodies Saints" premiere at the Sundance Film Festival. (Photo by George Pimentel/Getty Images)
Actors Rooney Mara, left, Casey Affleck, and Ben Foster attend the "Ain’t Them Bodies Saints" premiere at the Sundance Film Festival. (Photo by George Pimentel/Getty Images)

While Ben Affleck is busy being the darling of the awards season, his kid brother, Casey , is at the Sundance Film Festival promoting his new movie, “Ain’t Them Bodies Saints,” which costars fellow Boston native Ben Foster and former Oscar nominee Rooney Mara. In the film, which sounds just a tad bleak to us, Affleck plays a prison inmate whose sweetheart and onetime sidekick in crime is romancing a cop she shot during one of her misdeeds. . . . Weymouth’s Rob Corddry is also making the scene at Sundance to hype “In a World,” a comedy starring Lake Bell and Demetri Martin. Word is Corddry is mulling an offer to make a sequel to “Hot Tub Time Machine.”

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