The makeup queen has released a new book called Beauty Rules about makeup and skincare for teens and twentysomethings, but she says it’s important to set some ground rules for your tweens when they start packing on the lip gloss, eyeliner and mascara.

Do you think that young girls are starting to wear makeup earlier and earlier? Well, you’re not the only one. Suri Cruise, who’s 4, even totes her own makeup bag! Celebrity makeup artist Bobbi Brown addresses the situation in Beauty Rules, her newest makeup and skincare guide targeted toward teens and twentysomethings like Hilary Duff, who wrote the forward to the book. I sat down with Bobbi to get her thoughts on teens, tweens and makeup and asked her the question on all moms’ lips: How young is too young to wear makeup? Click here to read more