thrifty sister Madonna said it best: "We are living in a material world, and I am a material girl." Designer clothes crowd your closet, expensive gadgets pack your purse, and you always hunt for the hottest new styles. Too bad your credit card's about to max out! Daddy will only pay for so many Coach bags, so make sure you find a part-time job or babysitting gig to fund your lavish taste. Spending so much money on one person (ahem, yourself) can make you forget that others don't have it so easy. Try some charity or volunteer work, or simply act nicer to classmates who are less fortunate. Lastly, don't forget that the best things in life (like hanging out with family and friends) are free.