by Jenna Rosenstein
Peter LIndbergh/Allure Sure, they're twins, two tiny blonde businesswomen with mermaid-wavy hair--but Mary-Kate and Ashley Olsen's beauty and food preferences are truly individual. Here, their secrets, as told to writer Judy Bachrach.
The beauty products they can't live without: "I'm more of a skin-care junkie. I do Biologique Recherche--it's facials and things like that," says Ashley. "I've been using Sanitas," says Mary-Kate.
Their worst hair mistakes: "Extensions," says Mary-Kate. "I woke up one day and I said, 'You know, I don't want to wear a bikini top this summer, so I guess I'll get hair that covers my breasts.' And it did!" Ashley regrets the time she went brunette: "It just really wasn't great!"
See more: 8 Products for Better Brows
The best tip Ashley's learned from a makeup artist: "The classic Peter Lindbergh black-eye smudge, because we look shy."