From the start, their courtship was shrouded in secrecy. It began in February, when the actors were spotted together at a party for the film Black Swan (at the time, Johansson's rep denied romantic involvement). In March, they were photographed together in Mexico. Two months later, they attended the White House Correspondents Dinner together. Another report suggested that they were moving in together.
Penn, Johansson and their reps have been characteristically mum on the new speculation regarding their breakup.