Diary of a Teenage Millionaire — Elizabeth Ann Trigg

16 year old Corrie Shannon has always made the best of being poor, but when she wins fifty million dollars in a lottery, her life is about to change in a lot of ways! Soon she's going on cruises, shopping sprees, has a maid and a chauffeur, not to mention sudden popularity with guys, including celebrities! This is book 1 in a series.