Successfully Rehabbed: Cory Monteith
Who knew before playing high school jock Finn on 'Glee', Cory was actually quite the bad boy as a teenager--dabbling in marijuana and alcohol. At the age of 19, his family gave him an ultimatum to either turn himself into the police for theft or check himself into rehab. Luckily for Monteith (and us Gleeks), he chose to former and cleaned up his act!
Source: Splash News Online