Relatively stable by comparison, Kevin Federline has filed an order to show cause for primary custody of his two sons with troubled ex-wife, Britney Spears.
The documents were filed in Los Angeles Superior Court on Wednesday by Kevin Federline's lawyer, according to the source.
Britney's divorce was finalized less than two weeks ago. At the time, the couple agreed to split custody 50-50 of Sean Preston Federline, 22 months, and Jayden James Federline, 10 months.
But a source close to Kevin Federline said that the would-be-rapper was worried Spears was exposing the boys to "unnecessary risk" and that his lawyer, Mark Vincent Kaplan, "hopes to get Kevin primary custody."
In June, when the couple were wrangling over their divorce settlement, K-Fed was resisting signing the papers over escalating concerns about Britney Spears' rather erratic behavior.
While Kevin Federline has kept a low profile, Britney Spears, who spent a stint at Promises rehab center, has been a fixture on the nightclub and party scene.
The news of Federline's request for primary custody comes as photos have surfaced of his ex-wife topless in a hotel pool with Matt Encinias.
Calls to Spears' lawyer, Laura Wasser, were not returned.