Pharrell Williams is overwhelmed by the success of his new single 'Happy'.

The 40-year-old singer, who has also worked on Daft Punk's hit 'Get Lucky' and Robin Thicke's song 'Blurred Lines', wasn't sure how to deal with the attention from his own song conquering the charts.

He said: ''Seriously, I find myself trying to be cool about it, but I'm really like ... whoa! I've always produced music for artists who are going through this level of success, but I just didn't know it would be this crazy.

''I'm like with a sweet tooth waking up in Willy Wonka's chocolate factory.''

The star, who will perform at the BRIT Awards tomorrow (19.02.14) at London's O2 Arena, insists he didn't get sick of hearing the infectious songs he has worked on with Daft Punk and Robin Thicke, which have won a host of accolades, including Grammy Awards.

He added to Time Out magazine: ''I was just very thankful to all the people voting, requesting, downloading, sharing and talking about those songs.

''I always think it's really funny really funny when a person claims to be the author if their own success. They think it's all 'I, I, I'. And then when people don't like them anymore, they get all like 'But my success was supposed to happen'. No it wasn't. You forgot who gave you success. The people. The fans.''