Stephen Collin's Celeb Lawyer Mark Vincent Kaplan Arrested for DUI

The lawyer repping child molester Stephen Collins in his divorce is going to be jumping from courtroom to courtroom, because TMZ has learned he was busted for DUI Friday night.

Mark Vincent Kaplan -- who became famous repping Kevin Federline in his contentious divorce from Britney Spears -- was popped on the Sunset Strip just before midnight.

Kaplan flunked the field sobriety test and was taken to the West Hollywood Sheriff's substation and booked on DUI.