Happy Wives Club: One Woman's Worldwide Search For The Secrets Of A Great Marriage is a New York Times and USA Today Best Selling book written by American author Fawn Weaver.
 Released on January 7, 2014, Happy Wives Club debuted on the New York Times Nonfiction Paperback list at #3 in the January 26 edition of the New York Times Best Sellers List.
 Happy Wives Club chronicles the author’s journey through 12 countries and 6 continents in search of the universal secret to a happy marriage.
Paul Greenberg is a bestselling American author focusing on ocean and environmental issues.
 His book, Four Fish: The Future of the Last Wild Food, was published in 2010 by Penguin Press on July 15, and entered the New York Times Best Selling Hard Cover List as of August 13.
 In addition to its commercial success the book received wide critical acclaim, most notably on the cover of the New York Times Book Review by the Times' restaurant critic Sam Sifton "a necessary book," Sifton wrote, "for anyone truly interested in what we take from the sea to eat, and how".
 The book won the 2011 James Beard Award for writing and literature .
 Many of the themes in Four Fish were later explored in a 2017 Frontline PBS documentary Greenberg anchored and co-wrote called The Fish On My Plate .
 Greenberg's 2015 TED Talk has received over a million views.
JaQuavis Coleman is an American author.
 He is a member of the YMCMB book division, and along with his wife Ashley Antoinette, via the pen name Ashley & Jaquavis, is a New York Times bestselling author.
 He is married to New York Times Best Selling Author Ashley Antoinette.
 Ashley Antoinette and Jaquavis were named by "Ebony" magazine as one of the most powerful couples in 2012.
J.L. King is a New York Times best selling author, publisher, and HIV/STD activist.
 Subjects of his work include the nature of human behavior, effects of health issues on minorities, and sexual orientation and its impact on schools.
 King’s first book, "" appeared on The New York Times best seller list for more than 30 consecutive weeks.
Fern Michaels (born Mary Ruth Kuczkir; April 9, 1933) is an American author of romance and thriller novels, including nearly 150 best selling books with nearly 200 million copies in print.
 Her United States Today and New York Times best selling books include "Family Blessings", "Pretty Woman", and "Crown Jewel", as well as the Texas quartet and the Captive series.
Sarah Ban Breathnach (pronounced “Bon Brannock”), is a best-selling author, philanthropist and public speaker.
 She is the author of thirteen books, including "Simple Abundance: A Daybook of Comfort and Joy" which spent more than two years on The New York Times Best Seller list where it held the number one position for a year.
 To date, "Simple Abundance" has sold over 5 million copies and has been translated into 28 languages.
 Ban Breathnach's follow up book "Simple Abundance", "Something More", debuted at the number one spot on the best selling book lists of the "New York Times", "USA Today", "The Wall Street Journal" and "Publisher's Weekly".
 To date, "Something More" has sold over 1.2 million copies.
 Ban Breathnach was also the first author in the history of the "Wall Street Journal's" list of best-selling books, to appear in both the number one ("Simple Abundance") and number two ("The Simple Abundance Journal of Gratitude") slots.
Georgia Arianna, Lady Colin Campbell ("née" Ziadie; born 17 August 1949) is a Jamaican-born British writer, socialite, and television and radio personality.
 She has published three books about the British Royal Family.
 They include biographies of Diana, Princess of Wales, which was on "The New York Times" bestseller list in 1992, and Queen Elizabeth The Queen Mother.
 She has also written two autobiographies, one exploring her mother.
Empress Bianca, the first novel by Lady Colin Campbell, was initially published in June 2005.
 One month later, Arcadia Books, the British publisher, withdrew the book and pulped all unsold copies in reaction to a legal threat initiated on behalf of Lily Safra under her interpretation that the book was a defamatory roman à clef.
 After some changes the book was republished in the United States in 2008 by Dynasty Press.
Sean Llewellyn Williams (born in Whyalla, South Australia on 23 May 1967) is a New York Times best selling science fiction author who lives in Adelaide, South Australia.
 He is the author of over eighty published short stories and thirty-nine novels, including "Twinmaker" and (with Garth Nix) the "Troubletwisters" series.
 He has co-written three books in the "Star Wars: New Jedi Order" series and is a multiple recipient of both the Ditmar and Aurealis Awards. His novelisation of "" was the first novelisation of a computer game to debut at #1 on the "New York Times" bestseller list.
Renee Raudman (born October 29) is an actress and voice actress who performed the English voice of Nastasha Romanenko in the video game "Metal Gear Solid" (under the pseudonym of Renne Collette) and its (using her real name).
 She also provides the voice of the recurring character Ms. Butterbean on the cartoon series "The Grim Adventures of Billy and Mandy".
 Outside of voiceover, Renee has recorded over 30 audiobook narrations, including as a co-reader on "Dark of Night" written by Suzanne Brockmann ("New York Times" best selling author of "Into the Fire") and 13 books written by New York Times best selling author Ilona Andrews.

Question: The author of "Empress Bianca" also wrote a 1992 New York Times best selling biography of what princess?
Answer: Diana, Princess of Wales