Confessions of a Shopaholic by Sophie Kinsella

Kinsella's books are hilarious! The Shopaholic series features the character Rebecca Bloomwood who has quite a shopping addiction. In this first book Rebecca works for a financial magazine, then ends up giving financial advice while in the meantime she is wracking up huge amounts of debt. She has amazing ways of justifying to herself and others the most ridiculous expenses. And she ends up trying to cover up the situation she's end and digs herself deeper and deeper. This is a funny series!