The DNA of American Idol winner Kelly Clarkson is being auctioned off on eBay.

A budding entrepreneur from Iowa swiped the singer's discarded water bottle at a recent concert then put it up for sale.

The merchant declares: "I am auctioning off (1) 16.9 fluid ounce bottle of Dasani bottled water that Kelly Clarkson drank out of during her concert on April 2... Do you want to own some Kelly Clarkson DNA, then this is your chance.

"I was sitting in row 1, seat 14, literally 3 feet away from Kelly most of the night. After the second or third song she cracked open this Dasani and took a sip of it to restore her throat. Her lips touched this bottle!!!"

The seller goes on to suggest: "There is still a bunch of water in it, so you can drink the rest if you wish."

Bidding is currently up to $20.