Oksana Grigorieva has beefed up her legal team with a top criminal and civil attorney, Breaking Celebrity News has exclusively learned.

With no settlement looming in the bitter fight with Mel Gibson, Oksana is digging in for a fight and appointed James W. Spertus, a former federal prosecutor and an experienced trial attorney who specializes in civil and criminal litigation, to her growing team.

As we revealed, Oksana had been lawyer shopping and previously met with civil rights campaigner Lisa Bloom and Mark Lane, who wrote the JFK conspiracy book Rush to Judgment.