Mates, Dates and Inflatable Bras by Cathy Hopkins
Lucy feels like everything is changing around her, and suddenly she is required to make all sorts of decisions. Everyone else knows who they are and what they want to be except for her. Worse still, her best friend has hooked up with the glamorous Nesta. Can three girls be best friends? But then the day Lucy sees the most wonderful boy crossing the street, things do start to change - in all areas of her life... The first book in the highly successful MATES, DATES series that's sold over 3 million copies worldwide.