Junior High Girls Night Out

I work with the junior high awana program. So, we recently had a girls night out. The plan was to hang out and watch chick flicks. It was fun, we ate lots of food, saw a few new faces and some stayed up way too late (6am). But the reason behind my post is this:

One of the girls picked out a few movies to choose from. One was the movie dodgeball. We immediately told the girls that they couldn't watch that one because of the content (in fact I'm embarrassed that we own it and don't think we even watched the whole movie). If you're not familiar with this movie, check out Plugged In's movie review. Anyway, when I was cleaning up after the girls yesterday, I saw that the movie case was out of the cabinet and the DVD was in the player. It appears as though they watched it after all the adults went to bed (3am) even though they'd been told they couldn't. Needless to say I'm quite dissapointed in them. I'm not sure how to discuss it with them. Do I simply tell them that I'm dissapointed? I told Ryan about the situation and he shared that this week we start the "peer pressure" cd for teaching time and we could possibly tie it in with that. I guess I just don't want this to be completely ignored nor do I want to come across as super mean. We're trying to build relationships with these girls. Regardless of how raunchy the movie is, the fact is that they had it in the DVD player after they were told not to.

Thoughts?