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(Clockwise from top left) David Letterman, Adele, Tiger Woods & Dutchess Kate (© Reynaldo Ramon/US Air Force/Getty Images; Mike Marsland/Wireimage/Getty Images; Vincent Yu/AP; Tim Rooke/Rex Features)
Top celebrity smiles
Top celebrity smiles

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It's Power of a Smile Day (learn more about the holiday)! We're showcasing some of the most well-known goofy grins, quirky smirks and pearly whites. Can you guess which beaming faces they belong to?
 
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