Famous People Quiz for 29 April 2014

A new people quiz is available each week. Try our daily general knowledge quiz or work through our archive of daily and themed quizzes.

Question 1: Which of these is an American investigative journalist and author of several best-selling unauthorised "poison pen" biographies of celebrities and politicians, including Jacqueline Onassis, Elizabeth Taylor, Frank Sinatra, Nancy Reagan, the British Royal Family and "the Bush Dynasty"?