Jennifer Aniston shows up back to set of 'We are the Millers' in Wilmington, North Carolina on August 13, 2012. Credit:

Before she becomes Justin Theroux' wife in real life, Jennifer Aniston resumed playing Jason Sudeikis' faux spouse in We're The Millers August 13.

Three days after Theroux, 41, popped the question, Aniston resumed filming in Wilmington, North Carolina -- the same location where Dawson's Creek and One Tree Hill were shot -- with costars Sudeikis, 36, and Emma Roberts, 21.

Photographers were unable to get a shot of Aniston's engagement ring as she walked around set in a gray wrap dress and flip-flops. In the film, Sudeikis plays a pot dealer attempting to smuggle 1,400 pounds of marijuana across the country. He hires Aniston's character -- a prostitute! -- to play the role of his wife.

Prior to his proposal, Theroux was spotted visiting Aniston on location in the picturesque locale. On August 12, reps for both stars confirmed to Us Weekly that Theroux and Aniston, dating for 18 months, are planning to tie the knot.

"Justin Theroux had an amazing birthday Friday, receiving an extraordinary gift when his girlfriend, Jennifer Aniston, accepted his proposal of marriage," Theroux's rep said in a statement.

This will be the second marriage for Aniston, 43, whose five-year marriage to Brad Pitt, 48, ended in 2005. The Moneyball actor is currently engaged to Angelina Jolie, 37.