Now that Scarlett Johansson and Sean Penn's "are-they-or-aren't-they" relationship is officially no more, the reasons behind the unlikely couple's split have finally been revealed.
According to an Us Weekly insider, the 50-year-old actor broke it off with his much younger girlfriend because he simply isn't interested in getting serious right now.
Despite rumors of a break-up, the pair seemed to be doing just fine at their June 4th appearance at Spike TV's Guys Choice Awards - however, a witness revealed that was all Johansson, telling, "She sat down between him [Penn] and Robert De Niro. Robert was like 'What?' and made a face."
Further showing her desire to make things look all-good with the duo, a source dished that the 25-year-old was eager to step in front of the cameras, explaining, "A photographer asked for a shot. Before Sean could say no, she said yes."