A few photos taken of
Jennifer Aniston on the set of We're the Millers.
It looks like someone had to work overtime on this particular scene. It's in the movie, but you don't see any nipples from Jennifer in it.
And to answer someone's question, if Jennifer used a body double in the movie for her stripping scenes. Apparently not, there are a few cuts, mainly when she is filmed from behind during her strip routines, when you could swear she is using a body double, but then in another strip scene she does a 360 turns in front of the camera in her stripping gear, so I guess it's all her.