After receiving some of the best reviews of her career for her perf in HBO’s “Game Change,” Julianne Moore is ready to return to the bigscreen, as the thesp is in negotiations to co-star in Joseph Gordon-Levitt’s untitled directorial debut.

Gordon-Levitt will star and Scarlett Johansson is also on board.

Plot details are unclear, but Gordon Levitt will play a modern day Don Juan who sets out to become a less selfish person. Moore would play an unlikely mentor to his character.

Gordon-Levitt also penned the script and Nicolas Chartier’s Voltage Pictures will finance the film.

Ram Bergman will produce through his Ram Bergman Productions banner. Shooting will start next month.

The casting is a coup for the project, coming after raves for her portrayal of Governor Sarah Palin in “Game Change.” HBO also recently announced that the pic was the most-viewed telepic for the network in eight years, bringing in 2.1 million viewers.

Moore is also attached to star in Legendary’s “The Seventh Son,” which shoots later this year.

She is repped by CAA and Management 360.