Uglies by Scott Westerfeld

Everybody gets to be supermodel gorgeous. What could be wrong with that?

Tally is about to turn sixteen, and she can't wait. Not for her license -- for turning pretty. In Tally's world, your sixteenth birthday brings an operation that turns you from a repellent ugly into a stunningly attractive pretty and catapults you into a high-tech paradise where your only job is to have a really great time. In just a few weeks Tally will be there.

But Tally's new friend Shay isn't sure she wants to be pretty. She'd rather risk life on the outside. When Shay runs away, Tally learns about a whole new side of the pretty world -- and it isn't very pretty. The authorities offer Tally the worst choice she can imagine: find her friend and turn her in, or never turn pretty at all. The choice Tally makes changes her world forever.

Uglies was a very different perspective of our world in the future. There have been several variations as like in The Girl Who Owned the City by O.T. Nelson, all the adults were killed off by a disease and only kids survived. In The Hunger Games by Suzanne Collins, children from ages 12 to 18 had to participate in deadly games where only one survives. But this one by far was very different.

Everyone is either "Ugly" or "Pretty".

There's a separation between the two and once an 'Ugly' turns 16, they turn into a 'Pretty'. Until, Tally finds out about another group of people, who've escaped from the Pretty world. This is kinda similar as Katniss discovers about District 13 in Catching Fire.

Uglies was a different and fantastic different experience about the Post-Apocalyptic world. Can't wait to read "Pretties"!