Mel Gibson's high-powered criminal attorney Blair Berk has just been served, RadarOnline.com has learned.
The top lawyer emerged from a Los Angeles courtroom about 11.30am PT and was immediately served a subpoena.
It's unknown what the subpoena related to and the process server, one of Oksana's lawyers Allen Shiftman, would not reveal why.
"You are serving me in the hallway," a furious Berk told Shiftman.
Oksana and Mel are in court, before Los Angeles Superior Court Judge Scott M. Gordon, as part of their custody battle over their daughter Lucia, one.
At the hearing, the Lethal Weapon star will be confronted with the Russian singer's allegation that he is unfit to care for his child on overnight visits.