I don't really understand what motivates people who ascend to that level of wealth, but it does sort of make sense that they're happy to have a kid here, kid there etc.
They've got no real financial incentive for monogamy I guess. It'd be unsurprising if his relationship with this new woman went by the wayside fairly quickly.
Just look at Bendtner - knocks up a baroness considerably his senior, they have the kid, they split up, nanny looks after the child, he talks sagely about the "new responsibility" of being a father. It's weird. She's worth £400m apparently so that's a level up again in wealth.