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Pharrell Williams gets emotional at radio awards

2 May 2014 Last updated at 12:28 BST

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.

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