My opinion is that she probably really is pregnant. The onesie pics came out almost as soon as people started questioning whether or not the pregnancy was real. If it is a fake, they must have used a latex bump with makeup feathering into her real skin because it looks pretty convincing to me. There are pictures of her in that montage that show her upper arms (wearing a sleeveless shirt) to be a little on the plump side, as well as thighs and butt a little plumper than a 5'10" slender woman's thigh and butt normally would be. I also remember those bathing suit pics where her legs looked really big to me. For a tall, very slender woman, that's enough to tell me she's really pregnant.
The big thing that makes people think it's a fake, is the changing size of her bump--huge one day and relatively flat the next day. If she was wearing gradually increasing prostheses, then one would have to assume that she was wearing the wrong sized "pillows" on different days. I think if a fake pregnancy was happening, her scientology keepers would make damn sure she wore the right size bump. The simplest explanation is that her baby is flipping from head down or up to transverse, causing a wierd landscape on her normal thin frame.
She's a relatively young woman with probable normal fertility, why in the world would they need to fake a pregnancy when a real one would be more advantageous? By advantageous I mean for Tom to "prove" his manliness, heterosexuality and his crazy love for her. I wouldn't have believed it possible of Tom, if it hadn't have come out that Nicole miscarried a child of us.
I guess it's possible that the whole thing could be a big joke to see how lathered up the press and public get. I don't buy the conspiracy thing, though. Faking a pregnancy seems like a lot of trouble to go through if there was any sort of agenda. I absolutely, positively believe that the whole relationship was engineered, and that they may have been persauded to become pregnant for scientology reasons. I wouldn't put it past any of these wierdos to have engineered a real pregnancy. I don't buy the "we're crazy in love" thing from anyone except maybe poor dumb and naive ol' Katie.