Is Natalie Portman now the most famous person in America? Her raunchy new rom-com, No Strings Attached, in which the Black Swan star plays opposite Ashton Kutcher as "friends with benefits," won the weekend at the box office with a haul of $20.3 million. That’s one of the best bows of her career, and her first No. 1 since 2006’s V for Vendetta. It’s also a hefty figure considering the film’s low budget of $25 million. Portman is nearly a lock for Tuesday’s Oscar nominations announcement as well. The second-place flick was comic book comedy The Green Hornet, with $18.1 million, followed by Vince Vaughn comedy The Dilemma.