Multiparty child support

[Jcrew]

So KFed just obtained custody of his kids with Britney. I presume that he will be receiving considerable amounts of child support from her. He has kids from a prior relationship, which I assume that the amount of child support that he has to pay for those kids was determine at the time when he was not making all that much. Now does/should the income he receive from Britney factor in on how much child support that he has to pay for his previous kids?