I Don't Know How She Does Itis a 2011 American comedy film based on Allison Pearson 's novel of the same name. The film stars Sarah Jessica Parker , Pierce Brosnan , and Greg Kinnear about Kate Reddy, a financial executive and the breadwinner of her family.

By day, Kate Reddy ( Sarah Jessica Parker ) works for a Boston-based financial management firm; by night, she's a devoted mother to two adoring children and the happily married wife of out-of-work architect Richard ( Greg Kinnear ). Though balancing those two worlds has its fair share of challenges, Kate generally manages to come out on top thanks to the support of her best friend, Allison ( Christina Hendricks ), who's had plenty of experience balancing kids and a career. Meanwhile, on the other end of the spectrum, Kate's associate assistant, Momo ( Olivia Munn ), possesses a fear of children and a strong work ethic. Just when Kate lands a lucrative new account that will see her traveling across the country on a regular basis, however, her new business associate Jack ( Pierce Brosnan ) reveals his flirtatious side and Richard receives a job offer he can't turn down. Though it looks as if Kate and Richard couldn't possibly take on any more responsibility, the demands of modern living ensure they'll never have a dull moment, even if they try.