Scarlett Johansson is telling friends that she's head over heels again after a short-but-romantic vacation getaway to Mexico with Sean Penn. "She thinks Sean is amazing. Sure, he's an incredible actor, but there's depth. He's an amazing human being who cares about politics and the world," a friend of the young actress tells me.

The pair were spotted dining together in Cabo San Lucas three evenings ago and have since returned to Los Angeles via private plane for Scarlett to start filming her new movie with Matt Damon.