Williams was chatting with the TV mogul about his hit single "Happy" and its unexpected global influence when she played a compilation of fan-made videos from around the world. And that's when the tears came. "It's overwhelming because I love what I do," he said after regaining composure. "I just appreciate the fact that like people have believed in me for so long that I could make it to this point, to feel that."
Chris Pizzello / Associated Press
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