New Couple Alert: Sean Penn and Natalie Portman?

There could a new winner in the Wackiest Couples Ever category.

Star magazine claims that Sean Penn reportedly got cozy with the demure Natalie Portman after a dinner at the Sunset Towers Hotel’s Tower Bar on March 17th.

A witness alleges that Penn, who is married to actress Robin Wright-Penn, and Portman were “constantly touching each other” during their meal.

And that’s not all that is supposed to have taken place.

“They went to a bank of elevators that only goes to the spa or to private rooms,” a witness said. “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.”

Portman and Penn have met before, having previously served on the Cannes Film Festival jury in 2008.

Maybe he was trying to convince her to play the straight woman in the upcoming Three Stooges movie?