<Li> Jennifer Aniston as Sarah "Rose" O'Reilly / Miller, a stripper hired by David to pose as his wife . </Li> <Li> Jason Sudeikis as David Clark / Miller, a drug dealer who forms the Millers . </Li> <Li> Emma Roberts as Casey Mathis / Miller, a 20 - year - old runaway from neglectful parents, and thief, hired by David to pose as his teenage daughter . </Li> <Li> Will Poulter as Kenny Rossmore / Miller, David's socially awkward and underconfident 18 - year - old neighbor posing as his son . </Li>

Who is the girl in we're the millers