Mel Gibson, Oksana at the Courthouse

11/10/2010 3:03 PM PST

Mel Gibson, Oksana Grigorieva at the Courthouse

Mel Gibson just arrived at the courthouse in downtown L.A., as did his nemesis Oksana Grigorieva.

UPDATE 9:30 AM PT: Oksana's mom -- who was subpoenaed -- was ordered by Judge Scott Gordon to leave the courtroom because she's going to be called as a witness. 

And Sorrell Trope, who repped Oksana until recently, just left the courthouse after asking for Mel to pay his firm's attorney's fees.  Sources tell us Trope asked for around $200,000.

UPDATE 11:00 AM PT: We know the identities of some of the witnesses who will be testifying today. Mady Shany, Oksana's facialist, is in the hallway, sitting next to Oksana's mom. Also in the hallway -- Jimmy Hoyson, the music engineer who claims he saw the explosive January 6 fight between Mel and Oksana.

UPDATE 1:41 PM PT: Mel is heading back into court. It begins again...

Story developing...