Rawson Marshall Thurber will direct.
Pic follows a veteran pot dealer who creates a fake family as part of his plan to move a huge shipment of weed into the U.S. from Mexico. Kathryn Hahn will portray the wife of a DEA agent who’s on vacation.
Will Poulter and Ed Helms have also recently joined the “Millers” cast.
Tucker Tooley, Vincent Newman, and Happy Walters are producing, and production is set to begin July 23 in North Carolina.
CAA reps Roberts, whose upcoming pics include “Adult World” and “Empire State.” Her next film, “Celeste and Jesse.”