“Britney’s attorneys are anxious to see Kevin sign off on a divorce. But Kevin and his lawyer Mark Vincent Kaplan are dragging their heels out of concern over reports of Britney’s post-rehab partying. [Federline] 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.”

Kevin was pissed off when Brit took the kids to Hawaii without nanny against the agreement where it is specified she would not go anywhere without nanny.
As soon as she came out of the Rehab she was losing control over her clothes and guzzling cocktail while the kids were being looked after by the bodyguards. Britney is reportedly furious with her family and ex for forcing her into rehab and is said to be cutting ties faster.