In the episode where Jesse opens the Smash Club, look very closely in one scene. If you look in the corner, the wall is split. DJ can be seen talking with a crew guy.
Ok, you can't see that she's talking to a crew guy, you just see her playing with the front of her outfit a little bit and talking to someone, who could very well be KIMMY, since they both come out together later to show off their waitress outfits. The wall doesn't really look split, it could just be that you are looking into a different part of the club. I do agree that this was probably not intentional to be seen, but could be easily explained in the story line.