Ideas for a slumber party for girls ages 11-15?

My friends and I were thinking of hosting a slumber party for some young girls in our congregation. I was wondering what kinds of games/activities we could do with them? Any ideas? I've never hosted a slumber party before and I don't wanna come off too "old" acting or boring, I'm only 28! (which can be old to an 11yr old). Wholesome, but fun game ideas would be great, thanks:-)