Watch - Oprah Brings Pharrell Williams to Tears of Joy Over 'Happy'

“Why am I crying on Oprah?” Williams said.

April 15, 2014 — -- During an interview Oprah had with Grammy-winner Pharrell Williams on Sunday, the media mogul showed the singer a touching fan-inspired video from around the world set to his blockbuster hit song “Happy.”

After Pharrell, 41, told Oprah, 60, that his fans had taken over the song in a good way, making it their own, she showed him the clip of people putting up their own videos to "Happy."

Scenes from London, Detroit, Germany and other locations popped up on screen.

You can see the emotion in Pharrell's face and he hides his eyes and Oprah rubs his arm in support.

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"Makes me cry too!" Oprah said.

"Why am I crying on Oprah?" Pharrell responds. "It's overwhelming because I love what I do and I just appreciate the fact that people have believed in me for so long that I could make it to this point, to feel that."

It's a really amazing, candid moment from both icons.