Are you still rocking the same tube of MAC Fetish lipstick that you wore at your college graduation? Is your blush so worn down that you're using the last bit around the edges? If so, you have Beauty Separation Anxiety and, like Michael Jackson said, you are not alone. Unfortunately, it can be unsanitary to hold on to your makeup forever (bacteria and oil can build up on the products). Here, we chatted with celebrity makeup artist Oslyn Holder (Janelle Monae and Bette Midler are clients) about how to know when to toss your cosmetics.