After she dumped Birkhead, five or six months into her pregnancy it looks like Stern really went into action. Just to surmise here, suppose once she won at the SCOTUS he started plotting to get his hands on that $... after all, in his mind, he had been the lapdog and had no other clients, maybe he figured out a way to get back at her and get the $... just musing here.
She "appears" to look a lot more coherent (and affectionate) with Larry in the photos I've seen compared to those with HKS.