K-Fed goes commando for custody

Kevin Federline's lawyer is aiming for the jugular in his new custody battle for the two sons he fathered with Britney Spears - and he has called in an ex-Israeli commando to help.

Early yesterday morning, K-Fed's lawyer, Mark Vincent Kaplan, sent security expert Aaron Cohen out to track down and subpoena Spears' assistant Alli Sims, who is also the singer's cousin.

Also in Cohen's cross hairs was Spears' music producer Jonathan (J.R.) Rotem. Kaplan wants both questioned under oath about Spears' alleged erratic - and sometimes dangerous - parenting skills.