From Variety: Alan Arkin, Monica Bellucci, Maggie Gyllenhaal and Keanu Reeves have joined the already starry cast of Rebecca Miller’s “The Private Lives of Pippa Lee.”

Pic, which is produced by Elevation Filmworks and Brad Pitt’s Plan B Entertainment, already features Julianne Moore and Winona Ryder. Robin Wright Penn stars as a dutiful wife whose husband falls for a younger woman, freeing her to explore her buried sensuality and leading to “a very quiet nervous breakdown.”

Miller (”The Ballad of Jack and Rose”) directs from her own novel of the same title. Lensing is skedded to begin in April 2008 in Connecticut.

Samantha Horley’s London-based Lumina Films is executive producing the pic and handling worldwide sales, with CAA partnering on the sale of North American distribution rights. Jean-Luc De Fanti and Winchester Capital Partners provide finance and take exec producing credits.

Pic is the fourth collaboration between Lemore Syvan of Elevation and Miller, following “Jack and Rose,” “Personal Velocity” and “Angela.”