Tuesday was a day to remember -- we stopped by the main Brooklyn Public Library and sat down with singer Pharrell Williams.

Williams also stars as one of the judges on our favorite show, "The Voice." Pharrell Williams was promoting his new book "Happy," based on the popular song he wrote and sang for the movie "Despicable Me."

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Williams and Penguin Books are launching a campaign to donate books to children in need. We had so much fun talking with him. He was so nice and he had a lot of funny facial expressions.

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Each time we asked him a question, he would make a different face. Not only his facial expressions were interesting, though --  his answers were too. Williams' personality stood out the most. He was very gentle and funny, and he was grateful that we interviewed him. We had an amazing time meeting the one and only Pharrell Williams.