Elisabeth Shue: Good Genes or Good Docs?

Whether in 3D or not, Elisabeth Shue is too fab.

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Here's the 20-year-old Elisabeth back in the 1984 film "The Karate Kid" (left) -- and 26 years later, the 46-year-old Oscar-nominee at the premiere of her new flick "Piranha 3D" in L.A. this past week (right).

She's gone back to the future, too.