Arnold Hires Attorney, Hammers Out Divorce Deets

6/1/2011 4:00 AM PDT

Arnold Schwarzenegger Officially Hires Attorney Bob Kaufman, Hammers Out Divorce Deets with Maria Shriver

Arnold Schwarzenegger is pulling out a big gun for his inevitable divorce battle with Maria Shriver ... officially hiring attorney Bob Kaufman -- who's already tackling some touchy issues of the split. 

Sources tell TMZ ... Kaufman's already been in touch with Maria's attorney, Laura Wasser -- and we're told they are "moving forward" with divorce negotiations.

Kaufman and Wasser have gone head-to-head on other high profile celebrity splits -- and both specialize in something Arnold and Maria value right now ... keeping divorce settlements hush hush.