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Tony Bennett's Lady Gaga portrait to be auctioned off for charity

Lady Gaga's nude portrait painted by Tony Bennett after their recent studio collaboration is set to go up for auction.

The odd couple teamed up to record a rendition of classic song The Lady Is A Tramp for Bennett's Duets II album earlier this year (11), and the keen artist asked Gaga to pose for a naked sitting.

Now the pair is putting the piece under the hammer as part of an online celebrity auction for the Born This Way Foundation and the Exploring the Arts cause.

Also going up for sale are the accessories from the Annie Leibovitz photoshoot of the painting for Vanity Fair magazine, including the Poker Face hitmaker's sunglasses, ring, earrings and shoes.

The auction starts on eBay.com on Monday (12Dec11).