Greg Kinnear and Jane Curtin have been added to the cast of The Weinstein Company's I Don't Know How She Does It, starring previously announced Sarah Jessica Parker and Pierce Brosnan.

In this comedy of a working mother trying desperately to juggle marriage, children, and a high-stress job, Kinnear will play Parker's husband and Curtin will be Kinnear's mother, Parker's mother-in-law. Currently filming in New York, I Don't Know How She Does It is directed by Douglas McGrath (Emma, Infamous), produced by Donna Gigliotti (Shakespeare in Love, Let Me In) and executive produced by Scott Ferguson and Aline Brosh McKenna (The Devil Wears Prada), who is also the screenwriter.

I Don't Know How She Does It is based on the best-selling novel by Allison Pearson, which received rave reviews upon its publication by Alfred A. Knopf in 2002. The New York Times described it as "fast, funny, and heartbreaking," and Oprah Winfrey called it "the national anthem for working mothers."

"I'm so pleased with the wonderful cast that's been assembled," says Harvey Weinstein, co-chairman of The Weinstein Company. "They will bring to life Allison Pearson's funny, honest and moving characters."

I Don't Know How She Does It is being readied by The Weinstein Company for release in Spring 2012.