Carrie Fisher was an insecure 19-year-old when she appeared as Princess Leia in the first Star Wars movie, a role that would come to define her career. She tells Terry Gross that despite becoming romantically involved with her older, married co-star, Harrison Ford, she often felt isolated on set. Fisher has a new memoir, called 'The Princess Diarist.' Also, classical music critic Lloyd Schwartz reviews the national touring production of the Broadway musical "An American in Paris.'