Fergie was a Meth Head!
You can check out the full interview in Time Magazine. The Dutchess, her fist solo effort, is a major sucess and she says she's flying high on life right now but in the article she talks about how she used to get high on Crystal Meth, and how hard it was to break the habit!
Good for her, I know several people who ended up in the loonie bin from that stuff.