Jack's not the only Osbourne to have struggled with substance abuse as a teen. His older sister Kelly also started using at a young age. "I had my tonsils taken out [at age 13], and they gave me liquid Vicodin," she told People in 2009. "I found, when I take this, people like me. I'm having fun, I'm not getting picked on. It became a confidence thing." She went to rehab for her addiction to painkillers at 19 and 20.