Arnold Schwarzenegger appears to be back to his famous womanizing ways. The 64-year-old Governator was seen flirting with an attractive 20-something brunette at Bagatelle in West Hollywood on Friday night. A witness tells Page Six, “They were with a group of about six celebrating a birthday, but Arnold was focused on this younger girl who looked like a model. He had his hand on her knee, then his hand kept on going up . . . ” The spy said he was also seen “nuzzling” the girl. The group including Schwarzenegger and the girl later all left at the same time. After he admitted fathering a kid with their maid, Arnold had begged Maria Shriver to take him back, and The Post reported he and Maria had undergone couples therapy. During that time, Arnold appears to have kept a low profile in an attempt to win Maria over. TMZ yesterday reported that she’s repeatedly changed her mind about wanting a divorce and hoping to reconcile, but the site added that both are now expecting to divorce. But a family source, pointing out Arnold’s flirtatious reputation during their marriage, told us, “I wouldn’t read too much into this behavior with the brunette. This probably just means it is business as usual in the marriage.” A rep for Schwarzenegger said reports of him with the young woman “are grossly exaggerated and inaccurate. The governor was at a table with five other people. There was no inappropriate or amorous behavior. It was friends getting together, and the governor left the restaurant alone.”