<P> Shortly after leaving, David regrets abandoning them after hearing "Waterfalls" by TLC on the radio and returns to the carnival . Casey confides in Scotty about how she felt like she was actually part of a real family . Scotty tries to sexually harass Casey but is thwarted by Sarah and Kenny . David then arrives at the carnival, begging them to come back with him and offering each a full share of the profits . On their way to the RV, they encounter Edith and Melissa . In the ensuing conversation between the Millers and the Fitzgeralds, Kenny blurts out that they are smuggling the pot . One - Eye appears and is about to shoot everyone, but Don comes out of his camper and subdues him . Chacón then comes around the corner with Melissa held at gunpoint and again is about to kill them all, but is momentarily distracted by the 4th of July fireworks . David and Kenny then subdue him . Melissa and Kenny (with a newfound confidence) kiss, as do David and Sarah . Don arrests Chacón, but lets the Millers leave . </P> <P> David delivers the drugs to Gurdlinger, who tells him he is late and that their deal is off, but then admits that he had never intended to pay at all . DEA agents crash into the room, arresting Gurdlinger, revealing that David sold him out . Don, the agent in charge, tells David that he will have to be placed in the witness protection program until the trials of Gurdlinger and Chacón . He then adds that anyone who was a witness to the crime will be in protection, which pleases David . The Millers are then seen together in a suburban house with several marijuana plants growing in the garden . </P> <Ul> <Li> Jason Sudeikis as David Clark / Miller, a drug dealer who forms the Millers . </Li> <Li> Jennifer Aniston as Sarah "Rose" O'Reilly / Miller, a stripper hired by David to pose as his wife . </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> <Li> Ed Helms as Brad Gurdlinger, a drug lord who hires David to smuggle marijuana from Mexico . </Li> <Li> Nick Offerman as Don Fitzgerald, a DEA agent who befriends the Millers . </Li> <Li> Kathryn Hahn as Edith Fitzgerald, Don's wife . </Li> <Li> Molly Quinn as Melissa Fitzgerald, Don and Edie's teenage daughter and Kenny's love interest . </Li> <Li> Tomer Sisley as Pablo Chacón, a Mexican drug lord and the film's main villain . </Li> <Li> Matthew Willig as One - Eye, Pablo's henchman . </Li> <Li> Luis Guzmán as a Mexican cop who demands a bribe from the Millers . </Li> <Li> Thomas Lennon as Rick Nathanson, a former college classmate of David's . </Li> <Li> Mark L. Young as Scottie P., a kiddie ride attendant who befriends Casey . </Li> <Li> Ken Marino as Todd, the sleazy owner of the strip club that Rose worked at . </Li> <Li> Laura - Leigh as Kymberly / Boner Garage, one of Rose's fellow strippers . </Li> <Li> Sam Richardson as TSA Agent </Li> </Ul> <Li> Jason Sudeikis as David Clark / Miller, a drug dealer who forms the Millers . </Li>

Who played casey in we're the millers