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Twinning combo: The blond duo posed in cinched dresses and black tights for the JCPenney's Best of Spring Showcase in March 2010.

  • Mary-Kate stuck with an all-black palette in a cinched Dries Van Noten blazer and suede booties.
  • Ashley married navy and black in a sleeveless wool-blend minidress by Jil Sander with black tights and Mary Janes.

Read More Jil SanderDries Van NotenMary Kate OlsenAshley OlsenCelebrity StyleCelebrity LookbookFashion Birthday