Celebrity Twitter Hair and Beauty Tips

So many celebrities are tweeting these days, and among all the fan shout-outs and teasers for new projects, there are also some pretty great beauty observations. Whether it's Zooey Deschanel talking about her latest manicure, Ke$ha hyping up the benefits of backcombing, or Katy Perry explaining her latest hair saga, check out these glimpses into your favorite stars' dressing rooms.