For what end though ?. She certainly doesn't need the publicity or the money. As I've said on this thread, she's likely got a whole locker full of "revelations" that she's kept back in case she needs to up her profile again.
My personal feeling is that she's had him tested for fertility and he's passed, so she's had him knock her up and married him as a "reward", or so that she can get him to sign a pre-nup that contains some kind of confidentiality agreement.
She does need the publicity though to make money and the only way she can get publicity is by selling her 'relationships'...it's always been like that and the very reason she has the money she has......though I would be very surprised if her earnings are way below her expenditure these days.