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"This was truly the year of the billionaire bad boy in romance”Amazon readers just couldn't get enough of the genre," said Sara Nelson, Editorial Director of Books and Kindle atAmazon.com. "While E. L. James published the first two books in her Fifty Shades trilogy in 2011, so they aren't eligible for our 2012 list, the series really took off this year and propelled the third installment and the omnibus edition onto our top 10 list. It's also interesting to note that four of the five contemporary romance titles in the top 10 list, including the Fifty Shades trilogy, were originally independently published and went on to become huge best sellers."

The top 10 best-selling books overall are:

1. "Fifty Shades Freed: Book Three of the Fifty Shades Trilogy" by E. L. James

2. "Gone Girl: A Novel" by Gillian Flynn

3. "Fifty Shades Trilogy: Fifty Shades of Grey, Fifty Shades Darker, Fifty Shades Freed 3-volume Boxed Set" by E. L. James

4. "Bared to You: A Crossfire Novel" by Sylvia Day

5. "No Easy Day: The Firsthand Account of the Mission That Killed Osama Bin Laden" by Mark Owen

6. "The Marriage Bargain (Marriage to a Billionaire)" by Jennifer Probst

7. "Reflected in You: A Crossfire Novel" by Sylvia Day

8. "The Racketeer" by John Grisham

9. "Defending Jacob: A Novel" by William Landay

10. "The Innocent" by David Baldacci

The top 10 best-selling Kids & Teens books are:

1. "The Mark of Athena (Heroes of Olympus, Book 3)" by Rick Riordan

2. "The Third Wheel (Diary of a Wimpy Kid, Book 7)" by Jeff Kinney

3. "Insurgent (Divergent)" by Veronica Roth

4. "The Serpent's Shadow (The Kane Chronicles, Book 3)" by Rick Riordan

5. "The Fault in Our Stars" by John Green

6. "City of Lost Souls (Mortal Instruments)" by Cassandra Clare

7. "While it Lasts" by Abbi Glines

8. "The Rise of Nine (Lorien Legacies, Book 3)" by Pittacus Lore

9. "Wonder" by R. J. Palacio

10. "Nevermore: The Final Maximum Ride Adventure (Book 8)" by James Patterson