Farah Pahlavi, Empress of Iran is the widow and third wife of Mohammad Reza Pahlavi (the late Shah of Iran) and the only Shahbanu (Empress) of modern Iran. Though the titles and distinctions of the Iranian imperial family were legally abolished by the new regime, she often is styled Empress or Shahbanou, out of courtesy, by foreign media as well as by supporters of the former monarchy. She does use the title Empress Farah Pahlavi, a combination of title and surname that has no dynastic precedent, though her children do not use their former titles in any official manner.
In 2003, Farah Pahlavi wrote a book about her marriage to the Shah entitled “An Enduring Love: My Life with the Shah - A Memoir”.
Source: Wikipedia http://en.wikipedia.org/wiki/Farah_Pahlavi