With Janet Reitman's new book "Inside Scientology: The Story of America's Most Secretive Religion," building up steam, take a look at some of the most well-known, and most surprising, celebrity Scientologists.
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American actor Giovanni Ribisi is an active Scientologist along with his twin sister Marissa, who is married to the recording artist Beck, also a Scientologist. UPI/Rune Hellestad
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