[A*O]

I think it's all linked with Scientology and its requirement that senior members behave in a certain way. Tom's sexuality has been under scrutiny for years, and many people think he's gay. Co$ strongly disapproves of homosexuality, or believes it can be 'cured' with vitamins and brainwashing, errr sorry, 'therapy' so if Tom wants to progress to the highest level within the cult, errrrrrr sorry 'church' then he must be seen to be living like a happy hetero with a wife and baby to prove it (see John Travolta and Kelly Preston). Katie was carefully selected to fulfill the role of 'wife' and was probably paid handsomely too. Unfortunately, she does not have the mental resiliance to avoid getting sucked into the Scientology madness so now she's a lost cause. The 'pregnancy' is fake, although they WILL produce a baby from a Scientology surrogate.