The big man himself hasn't weighed in, but friend Maria Shriver tells E! Online that a report about Jack Nicholson retiring from acting is absolutely false. Shriver was responding to a story at RadarOnline alleging that the 76-year-old was done because of memory problems. Its source is an unnamed "Hollywood film insider." Nicholson has no such problems, says Shriver, and E! cites a source of its own who says he's currently reading scripts.