...  10 Celebrity Scientologists 4. Jenna Elfman. The Dharma and Greg actress is tightly knit with fellow Scientologist Kirstie Alley and Laura Prepon (who also appear on this list). … The actress credits the Narconon anti-drug programme with helping her beat drug addiction … Read more on Irish Independent Tags: drug addict, irish independent, drug addiction, laura prepon, kirstie alley ...