There are 4 books in the Uglies series. The newest book is Extras which came out in 2011.

Soon to be a major motion picture streaming on Netflix!

The first installment of Scott Westerfeld’s New York Times bestselling and award-winning Uglies series—a global phenomenon that started the dystopian trend.

Tally is about to turn sixteen, and she can’t wait. In just a few weeks she’ll have the operation…
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2
Pretties

Book cover of Pretties
The second installment of Scott Westerfeld's international bestselling Uglies series - the global phenomenon that started the dystopian trend.

In Tally's world, looks are all that matters. And now that she's finally undertaken the surgery to become a 'Pretty', everything seems perfect: her looks are flawless, her clothes are cool,…

3
Specials

Book cover of Specials
"Special Circcumstances"... the words have sent chills down Tally's spine since her days as a repellent, rebellious Ugly. Back then, the Specials were a sinister rumour - frighteningly beautiful, dangerously strong, and breathtakingly fast.

And now Tally's become one of them: a super-amped fighting machine, engineered to keep the Uglies…

4
Extras

Book cover of Extras
These days it's all about the fame.

As if life isn't hard enough when you're fifteen, Aya Fuse's face rank of 451,369 is so low, she's a total nobody. An Extra. But when she meets a clique of girls who pull crazy, dangerous tricks in secret, Aya sees a way…