OK! Exclusive: Sean Penn Spotted With Mystery Brunette

(Getty Images)

The ink on his divorce from actress Robin Wright still has months to dry, but Sean Penn is a man of action.

In the months following his divorce announcement, the 47-year-old Oscar winner has made no secret of his intent to move forward as a single man, most recently escorting supermodel Petra Nemcova to the Academy Awards.

Now, OK! can confirm that on Tuesday, the actor was spotted in San Francisco at the historic Westin St. Francis Hotel, where eyewitnesses saw him canoodling with another mystery woman who was — most notably — not Petra Nemcova.

"She was a brunette, and looked like she was in her mid-twenties and was wearing tight jeans with tall boots," a hotel eyewitness tells OK!. "They walked affectionately through the lobby together and down to the garage and he kissed her goodbye. "

Sean, wearing a black suit, got into a black Ford Shelby Cobra Mustang. His mystery date walked back into the hotel, where insiders say it appeared the two had been staying together.

True to form, another hotel patron tells OK! that the actor didn't seem to mind who saw him. "His car looked like the 'Bat Mobile.' When he got in, he gunned the engine for a few seconds and drove off, and the tail pipes gave off this deep throated roar."

Sean and Robin Wright, 41, announced they were divorcing in December after 11 years of marriage. They started dating in the '90s and have starred in several movies together. Sean won an Academy Award for his role in the 2003 film Mystic River. The couple have two children, Hopper Jack, 14, and Dylan Francis, 16.

By: Jayne Rhames