Sean Penn And Natalie Portman?

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Everyone knows Sean Penn has fooled around on Robin Wright more than once, but now he has been spotted making out with Natalie Portman! Is she still dating that hobo dude?

"They went to a bank of elevators that only goes to the spa or to private rooms," an eyewitness tells Star. "They came back about 45 minutes later, and that's when I saw them making out." "There's a door outside of the hotel's Tower Bar that has a bridge to the terrace, so it's semi-private," the eyewitness explains. "I used that path to get to the restroom, and when I came back, I had to go through some curtains -- and that's when I interrupted Sean and Natalie! When they saw me, they were startled and quickly composed themselves."