Glee Star Cory Monteith who plays Finn in the American Musical Comedy has entered rehab over the easter weekend after seeking professional advice, Cory is entering Rehab because of Substance Addiction. He Voluntary went to a treatment facility for substance addiction, and he asks for privacy as he makes his recovery as we know many celebs with ill health get papped for entering rehab. It is not the first time Cory has entered rehab in 2011 at the age of 19 he entered because of addictions. The Creator Ryan Murphy and Girlfriend and co-star Lea Michelle are proud of Cory for taking this step foward.