Oksana Grigorieva -- I'll Tell Everything About Mel

7/14/2010 5:05 PM PDT BY TMZ STAFF
Oksana Grigorieva was strategizing with her lawyers in Century City today -- getting ready for next week's big custody hearing with Mel Gibson ... but before she walked into the office, she told photogs that she'll be tellin' the whole story.

Mel's lawyers have filed a motion to hold Oksana in contempt, because they believe she violated a restraining order by allegedly releasing the secretly taped conversations.  Oksana denies she's the leak.