Perry and Williams' charity auction
Katy and Robbie are taking part in an online auction for victims of the Japanese earthquake.
The pair are joining a host of artists in donating personal items to the Japanese Red Cross over the next three weeks.
Robbie is auctioning off a lifesize cardboard cut-out of himself on eBay and Katy Perry is selling off a signed poster.
Their record label, EMI, will match all funds raised from the auction.
To bid on the auction, you can visit: http://ebay.com/EMIfamily4Japan