Diane Keaton is set to star with Jon Heder in “Mama’s Boy,” the Warner Independent Pictures comedy that marks the feature directing debut of Tim Hamilton. Keaton plays the angelic mother of an arrogant pseudo-intellectual (played by the “Napoleon Dynamite” star). When mom falls in love with a self-help guru, her slacker son regards the romance as a threat that might force him to leave the nest. He does everything he can to disrupt the romance.

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