Charity Auction.

Eric Clapton has taken his hat off and donated it to an auction to help raise money for the homeless in and around London.

Eric Clapton has taken his hat off and donated it to an auction to help raise money for the homeless in and around London. He signed and turned over a brown John Pearse flat cap to St. Mungo's 2012 Celebrity Hat Auction on eBay, which ends Sunday.

Other celebrities who've tossed in their caps include Daniel Craig, Hugh Jackman, Kevin Spacey, Renee Zellweger, Michael Buble, Annie Lennox, Roger Federer and Kate Bush.