Mary-Kate Olsen appeared on David Letterman last night to promote her new movie, The Wackness. The movie title could pretty much be used to describe the vast majority of her fashion choices because she just dresses outright weird. However, that aside, Mary-Kate had the best fashion advice for young Hollywood celebs that I have ever heard and I would love to see everyone take it to heart. She said, “Please wear underwear. Wear your panties.”

Yes, please. I’d like to live out the rest of my life without ever seeing another closeup of a female star’s anatomy as they exit a car, thanks.