Pharrell Williams becomes emotional on Oprah Winfrey`s show

London: Grammy award-winning rapper Pharrell Williams became emotional and shed tears of joy during an interview with Oprah Winfrey.

The 41-year-old singer cried out of happiness after Oprah, 60, showed him a montage of fan videos to his hit track `Happy`, reported Contactmusic.

"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 said on the show.

Pharrell was particularly delighted by the song`s success as it had struggled to get any radio play before its release.

"Zero air-play, nothing. And the next thing you know, we put out the video on November 21 and all of a sudden... Boom. I mean, when I say boom, I mean boom. And we were like, what`s happening? First of all, people are putting up their own videos. It was like no longer my song," he added.

`Happy` has topped musical charts almost all over the world.