Kevin Federline is leary of signing final divorce papers due to his estranged wife, Britney Spears‘, recent behavior.

The couple came to an agreeent in March, that once they sign the papers they would share joint legal and physical custody
of their boys.

"Britney’s attorneys are anxious to see Kevin sign off on a
divorce," a source in the Federline camp says. "But Kevin and his lawyer Mark Vincent
Kaplan are dragging their heels out of concern over reports of
Britney’s post-rehab partying."

"He wants to make sure that
the divorce document makes it simple enough for Kevin to downsize
Britney’s access to her kids the next time her behavior troubles him."

Source