Natalie Portman and Sean Penn Caught Making Out

Natalie Portman is not as squeaky clean as we thought. (Warner Bros. Images)"]
The Rumor Mill is spitting out the news that Natalie Portman and the married Sean Penn were caught macking on each other.

Star apparently has a "source" who sounds like a totally nosey bitch. The source reports, "'They went to a bank of elevators that only goes to the spa or to private rooms. 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.'"

This isn't the first time Penn has been caught being gropey. Last April, divorce proceedings between Sean Penn and his wife Robin Wright Penn (a.k.a. Princess Buttercup) were sparked when Sean apparently got jiggy with Sienna Miller.

There was also that incident with two other chicks, as well as Lindsay Lohan. However, the Penns patched things up and filed paperwork to dismiss their divorce.