Carrie Fisher, last seen as Princess Leia in “Star Wars,” has signed for a starring role in Universal^ upcoming comedy “I Want ToHold Your Hand.The movie concerns itself with six New Jersey youths in the 1960s and happenings surrounding the Beatles first visit to the US, to appear on the Ed Sullivan Shovv,Ms Fisher, who in real life Is the daughterof Debbie Reynolds and Eddie Fisher, is castas a teenage social activist who protests the commercialism of Beatle records andnovelties. *Steven Spielberg, the director of “Jaws” and the forthcoming sci-B thriller “Close, Encounters, is executive producer. .