Hilary Duff used her status as guest editor to bring up the subject of finances to teens in the October issue of Seventeen magazine. "So many of my friends have started getting credit cards, and the banks don't really tell you how this works, like 'Do this, but don't do that,'" Duff says. "So it was important for me to put financial info in there, to let kids know that you have to pay attention to certain things and not fall into a trap. It's only been within the last two years that I started to get interested in my business and my money and how investments work. I had no clue before. But I've learned so much just sitting with my business manager." Kudos to Hilary for addressing this important issue with teens.