I've been fighting this with my daughter, 10, since she was 9. My solution - I bought her a "play" set for Christmas. Just for "play" during sleepovers, etc. Then one day she emerges for school looking like she just came in from a night at the clubs! I scrubbed her face and told her that she can only wear makeup if she asks first. Usually the answer is no. But, you can't say no everytime. So, for special occasions, a school dance, etc., I spend more time than is necessary to put little, if any, on her. Because of the amount of time I spend doing it, she seems to think she is wearing "full-on" makeup, even though she is practically bare-skinned. A little devious...but saying "No" all the time is destined to backfire. Kid's today are just growing up faster...so we must remain vigil staying one step ahead.