Clean-cut rapper/producer Pharrell Williams only got high once when he gobbled up six hash brownies - and his music became colourful.

The hunky star steers clear of alcohol and drugs as a rule, but he admits he did try marijuana once and had a very strange experience.

He explains, "I'd made a beat in the studio and all of a sudden all these vivid colours started coming outta the speakers. It was crazy. When I hear music I can imagine a virtual picture, but this time I could see it.

"All of a sudden, everything was like 'woah.' S**t was turning into flowers and s**t."