"Saturday Night Fever" star John Travolta has been practicing Scientology since 1975, when he read the book "Dianetics" on the set of "The Devil's Rain." His wife, Kelly Preston, is also a practicing member and made headlines when she said that Scientology helped her deal with her son Jett's death. She has opted for silent child births, which the church advocates. "It's just no words as much as possible. If you need to moan, if you cry out or all of that, of course, is normal," Preston said. "But just bringing them in as peaceful and gentle a way as possible."