12 celebrities you never knew had a secret twin

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ashton kutcher michael kutcher

Getty/Adam Bettcher

Ashton Kutcher is a twin.

Everyone's heard of celebrity twin pairings like Mary-Kate and Ashley Olsen - but you probably didn't know that stars like Ashton Kutcher or Vin Diesel are twins, too. 

Here are 12 famous set of twins you've probably never heard of before.