You might want to take this in with a grain of salt. Tabloids are buzzing with reports that 48-year-old Sean Penn may have left his long-time wife Robin Wright Penn to be in the arms of actress Natalie Portman. Penn filed for separation from his 43-year-old wife a few weeks after Star magazine reported Portman and Penn were seen kissing after a dinner at the Sunset Tower Hotel bar. "She stimulates him in ways no other person has, mentally or professionally," a source said. "There's a lot more there with Natalie than any of the other girls Sean's been with." Girl, indeed. For those keeping count, the Garden State actress is 27.