10 Rocking Rehearsal Photos from A Very GRAMMY Christmas

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3. How could Pharrell Williams not be "Happy" right now?

Pharrell Williams ( rehearses for A VERY GRAMMY CHRISTMAS to be broadcast Friday, Dec. 5 (9:00-10:00 PM, ET/PT) on the CBS Television Network Photo: Lisette M. Azar/CBS ©2014 CBS Broadcasting, Inc. All Rights Reserved