Hollywood actor Robin Williams has offered to record one lucky fan's voicemail message to raise cash for charity.

The Mrs. Doubtfire star is auctioning a special prize by offering to record a customised outgoing voicemail message for the highest bidder.

The lot, which is being auctioned on Charitybuzz.com, is expected to pull in up to $3,500 (£2,300), with all the proceeds going to a small family-run charity, the Dominic M. Aguilar Special Needs Trust.

The foundation was set up to support 12-month-old Dominic Aguilar as he battles a rare brain condition which slows down his development, called bilateral perisylvian polymicrogyria.