Famous for putting their wallets where their mouths are, celebrities including Katy Perry and Brad Pitt have donated their personal belongings and talents to a new charity launched by eBay, RadarOnline.com has learned.

eBay.com/Celebrity is uniting fans with their idols' favorite causes through celebrity charity auctions where they can bid on coveted items or attend events that bring them face-to-face with the stars.

Some of the initial opportunities on the auction block are a meet and greet with Brad Pitt to benefit Make It Right, a red sequined dress worn by Katy Perry supporting the American Red Cross, and a private acting workshop with Robert Duvall supporting the Robert Duvall Children's Fund.