Amazon reported its fourth quarter earnings today and revealed that its net sales increased 35% to $17.43 billion compared with $12.95 billion in fourth quarter 2010.

The company attributed the growth to Kindle sales. According to the press release, “during the nine-week holiday period ending December 31, 2011, Kindle unit sales, including both the Kindle Fire and e-reader devices, increased 177% over the same period last year.”

The Kindle Fire tablet was the best selling product during the quarter. Jeff Bezos, founder and CEO of, stated: “We are grateful to the millions of customers who purchased the Kindle Fire and Kindle e-reader devices this holiday season, making Kindle our bestselling product across both the U.S. and Europe. Our millions of third-party sellers had a tremendous holiday season with 65% unit growth and now represent 36% of total units sold.”