Pharrell's days as a mad hatter may be coming to an end.
The famous Vivienne Westwood hat that the producer, rapper and singer wore at the Grammy Awards is being auctioned on eBay to support his charity.
Bids had reached more than 10,000 US dollars (£6,013) by Friday afternoon for the brown fedora, which became a trending topic on Twitter after Pharrell wore it.
Proceeds will support Pharrell's From One Hand to Another charity. It provides arts and educational resources for children.
He will perform his hit Happy at the Academy Awards on March 1. The song is nominated for best original song and is currently number 2 on the US Billboard Hot 100 chart.
Pharrell will also release the album G I R L on March 3.