Katie Holmes and the Giant Binky

When Tom Cruise visited his local orthodontist's office recently, it wasn't to talk about his children's teeth. It was to craft a personalized pacifier — for fiancée Katie Holmes! "In keeping with a Scientology silent birth, Tom is prepared to do whatever it takes to muffle Katie's moans and groans during the delivery," says a source close to Holmes. "He commissioned an adult-sized 'binky' for her to clench between her teeth, hoping that it'll squelch her screams." The one-of-a-kind pacifier is made of rubber, and is molded to the shape of Katie's teeth. The mom-to-be herself, though, may prove harder to mold: As Tom goes further and further to ensure that the birth fits squarely within the rules of his church, Katie is showing serious signs of wear.

For weeks, Star reporter Brannon Castleberry has watched Katie, 27, spend day after day — up to eight hours at a stretch! — at the Scientology Celebrity Centre in Hollywood, often with Tom, 43, by her side. Now, Star has learned what's going on behind those closed doors: "If they're going to the center together regularly, it means that she is definitely resistant to something," a Scientology expert who prefers to remain unnamed tells Star. "It wouldn't surprise me if Katie secretly wanted out of Scientology, out of her relationship with Tom, or both." The source says that at the center, "they are probably putting tremendous pressure on Katie to find out if she has any second thoughts about Scientology."