Extra is reporting that pop singer Demi Lovato has been rushed by ambulance and was admitted to the hospital after suffering what appears to be a heroin overdose. Sources say she was at her Hollywood Hills home and was rushed to an L.os Angeles area hospital. Her condition is unknown at this time. Lovato has been open about her battle with addiction and has sought treatment in the past. Demi revealed she had relapsed when she released her new song “Sober” last month.