Natalie Portman & Sean Penn Caught Hooking Up!

Star Magazine is reporting that Sean Penn was just caught making out with Natalie Portman at the Sunset Towers Hotel!

"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. 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 comes as a surprise as no one thought these two individuals are even somewhat close to a match. Do you think this is just a quick hookup or will an actual relationship blossom? More pics of the pair here...