"A couple of months before I went to rehab, I had a birthday party and there were a couple of hundred people there. It was full of people who I considered my closest friends. When I turned my phone on after being in rehab for three months... I had four texts. That was a wake up call. Now I have people who, if I break my leg in the middle of the night, they'll come to the hospital with me." Demi Lovato lost friends during her 2011 rehab stint.