Pharrell Williams
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Pharrell's emotion at radio awards

Pharrell Williams gets emotional, Rihanna wins big and a never-before-heard Michael Jackson track is played at the first iHeartRadio awards in the US.

It was an emotional night for Pharrell Williams at the first ever iHeartRadio awards in the US.

The singer looked close to tears as he accepted his award for musical innovation from singer Gwen Stefani.

Rihanna was the evening's biggest winner with four prizes.

And a never-before-heard Michael Jackson song provided the soundtrack for a dance from Usher.