'Happy' Makes Pharrell Williams Cry On Oprah - Video

16 April 2014, 10:31 | Updated: 16 April 2014, 10:32

Watch what happens when the American chat show host chats to the singer about his hit tune.

It's certainly infectious and here at Heart, we can't get Pharrell Williams' 'Happy' out of our heads!

But what happens when the American singer joins Oprah to catch up about his chart topping song...not even we could have predicted!

The 41-year-old can't hide his surprise that his catchy song has gone viral: "It was like it was no longer my song".

When Oprah shows the hit maker a video compilation of people creating their own 'Happy' dances, it all proves too much for the singer who breaks down in tears of joy whilst the chat show host hands him a tissue.

The singer asks the cameras "Why am I crying on Oprah?", but his compassionate interviewer shows her understanding nature when she says: "It's being used for something greater than yourself."

Watch at people the world over, from London to Malawi to Iceland shake out the moves...but be prepared to be reaching for those tissues!