Welcome to New York City's Upper East Side, where my friends and I live in luxe Fifth Avenue apartments and attend Manhattan's most exclusive private schools. We're smart, we've inherited classic good looks, we wear fantastic clothes, and we know how to party. We can't help it-we were born this way. Our story begins with three inseparable, completely gorgeous fifteen-year-olds, Serena van der Woodsen, Blair Waldorf, and Nate Archibald. Blair's...