The actor took to Instagram on Friday, posting a picture of himself and Zoolander star Ben Stiller in Paris.
"This is in-seine #paris," Theroux, 44, captioned the picture, referring to the Seine river, which just so happens to be in the background of the pic, along with the Eiffel Tower.
In the foreground of the photo, Theroux poses with a selfie stick, while Stiller stands beside him giving his signature Blue Steel face.
The duo worked on the upcoming Zoolander 2 film together, with both men co-writing, and Stiller starring in the much-anticipated sequel.
The film hits theaters Feb. 12.