John Krasinski by Brian Ach/WireImage.com
's John Krasinski and
Saturday Night Live
missing person Maya Rudolph are having a baby... in an as-yet-untitled big-screen comedy. According to
, the Sam Mendes film follows an expectant couple as they traverse the country in search of a place to lay down their family roots. Krasinski and Rudolph previously worked together on the voice cast for
Shrek the Third
Shooting starts in April, and Cheryl Hines is onboard to costar.