By Margaret Lyons
March 09, 2009 at 02:45 PM EDT

Rita Wilson has been cast as Meryl Streep’s best friend in the upcoming Nancy Meyers film about a love triangle between Streep, Alec Baldwin, and Steve Martin. The cast also includes John Krasinski. Meyers is writing and directing the still-untitled film, as she did with 2003’s Something’s Gotta Give, and 2006’s The Holiday.