Tears of joy!

Pharrell Williams appeared on Oprah Prime on Sunday night and was moved to tears when the talk show host played him a montage of fans from around the world dancing and singing to his song "Happy".

"It's overwhelming, because it's like 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," he explained.

Queen O had nothing but praise for the music man, too!

"I so now get why it's so infectious - because it came from such a clear space that the energy was absolutely uninterrupted by anything than allowing it to flow from the heart to heart," she gushed.

We love him even more after seeing this!