Arnold Schwarzenegger's Baby Mama -- Finally Divorced

Arnold Schwarzenegger's baby mama, Mildred Patty Banea, is officially a single woman ... nearly four years after she filed for divorce from her husband ... TMZ has learned. Baena's divorce made the news shortly after it was revealed she had the Governator's love child because her divorce docs stated she and her husband had no minor children.

 Baena originally filed for divorce in February 2008, seeking nothing in support. Finally, on January 3, she filed for a default judgement ... and it was granted that day. Arnold, of course, is in the middle of his divorce from Maria Shriver. But as TMZ first reported, Shriver has been having second thoughts on pulling the plug and Arnold has recently been spotted wearing his wedding ring.