Uglies 2: Pretties - Scott Westerfeld

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, her boyfriend is totally gorgeous, and she's completely popular.

But beneath the fun of non-stop parties, high-tech luxury and apparent total freedom, Tally can't stop a nagging sense that something is wrong. Something important. Then a message from her 'Ugly' past arrives, forcing Tally to remember the truth she learned before her transformation, and the fun stops cold.

Because the true price of this perfect world is more than Tally is willing to pay...