Oksana Grigorieva Switches Lawyers

We've learned Oksana signed a retainer agreement this afternoon, officially hiring Sorrell Trope to replace her existing family law attorneys.

Trope's firm has represented all sorts of A-list celebrities -- including Anna Nicole Smith and Britney Spears.

So far, Oksana has not been able to squeeze an extra penny out of Mel in family court -- she's still getting $5,000 per month in child support plus housing expenses.