Replaces 'Harry Potter and the Deathly Hallows' in top spot.
It's no secret that the e-reader has been a huge festive success, but Amazon still won't be drawn on numbers.
However, various analysts have put the figure at over 5m since August.
"We're grateful to the millions of customers who have made the all-new Kindle the bestselling product in the history of Amazon -- surpassing Harry Potter 7," said Jeff Bezos, Amazon.com founder and CEO.
"We're seeing that many of the people who are buying Kindles also own an LCD tablet. Customers report using their LCD tablets for games, movies, and web browsing and their Kindles for reading sessions.
"They report preferring Kindle for reading because it weighs less, eliminates battery anxiety with its month-long battery life, and has the advanced paper-like Pearl e-ink display that reduces eye-strain."
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The company also announced that on its peak day, Nov. 29, customers ordered more than 13.7 million items worldwide across all product categories, which is a record-breaking 158 items per second.
