According to
http://pbskids.org/itsmylife/celebs/celeb_quotes.html
Hilary Duff says, "I've never done any drugs in my life. Party means for me hanging out with my friends and having a good time. You don't need drugs to have a good time and I hope none of you guys ever take any drugs and if somebody offers them to you just say NO!! People don't need drugs to be cool or hip, please guys don't do any drugs!!"
Freddie Prinze Jr. likes to stay clean and sober: "I've never done drugs or even smoked a cigarette. I don't like the idea of being controlled [by drugs]. "