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Kevin Federline's attorney, Mark Vincent Kaplan, is currently making a case in court for his whopping half-a-million dollar fee to be paid in full.

He had asked that the Commisioner to close today's session to discuss the bill (what's he got to hide?), but the Commisioner wasn't buying it and the court stayed open.

Kaplan argued it was actually 8 emergency hearings called by Britney Spears that he had to attend which boosted his fees, NOT his multiple tv appearances (which he says he didn't bill for).

Kaplan also had to spend extra court time and billing time dealing with her drug testing issues, her 5150 issues and her temporary restraining orders, so he's arguing that his full fee should be paid by Brit.

Stay tuned for more updates...