Scarlett Johansson and Sean Penn snuck out of a back door last night after attending the White House Correspondents' Dinner, hosted by Seth Meyers, in Washington DC. They then hit the Bloomberg and Vanity Fair cocktail party at the residence of the French ambassador, but apparently preferred to continue the evening as a twosome. She actually arrived to the first event on the arm of her brother Hunter, just as she did last year. Scarlett and Sean apparently have bonded over their love of politics — she recently showed off her activism in a PSA for Planned Parenthood, and Sean, of course, champions a variety of liberal causes, relief for Haiti in particular. Sean and Scarlett have found time in their busy schedules to focus on their growing relationship, which started once she separated from husband Ryan Reynolds. Now that Scarlett's living in Sean's LA home, they'll be able to see lots more of each other despite their jet-setting as a couple or on their own.