Twinning combo: Donning exquisite couture creations, both girls followed the "Model as Muse" theme at the 2009 Costume Institute Gala.

  • Ashley was angelic in a draping, long-sleeved white gown with a plunging back.
  • Mary-Kate looked statuesque in a tiered, Victorian-inspired Christian Lacroix gown and a perfectly messy half-up 'do.

Source: Getty
Read More Christian LacroixMary Kate OlsenAshley Olsen
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