Scarlett Johansson dating Sean Penn?

The 26-year-old actress is said to be “smitten” with the 50-year-old actor after hooking up with him in January while she was staying at Los Angeles’ Chateau Marmont hotel while she filmed ‘We Bought a Zoo’ with Matt Damon.A source told the new issue of Us Weekly magazine: "Their first hook-up was in Scarlett's Bungalow. she is smitten with him."Scarlett – who split from husband Ryan Reynolds in