Lady Gaga Nude Sketch by Tony Bennett for Sale

Lady Gaga reclining, cigarette in hand and not a stitch of clothing on, although the pose and a well-placed arm reveal very little. That's how the singer looks in the sketch of her drawn by crooner Tony Bennett.

The sketch is now on auction on eBay to benefit Tony Bennett's charity, Exploring the Arts, which helps fund art programs in public schools, and Lady Gaga's charity, Born This Way Foundation, with seeks to empower youth. But hurry, the bidding ends Dec. 19.

According to the eBay website, the sketch was made after Lady Gaga and Bennett recorded "Lady Is a Tramp" for Bennett's newest album, "Duets II." She agreed to pose for him and for contributing photographer Annie Leibovitz.

The sketch and the photograph will be in the January 2012 issue of Vanity Fair.

According to the Hollywood Reporter, Lady Gaga seems very confident about her body considering her usual wardrobe, but she did express a little discomfort for this session on her Thanksgiving special, "A very Gaga Thanksgiving."

"I walked in and said, 'Well Tony, here we are' and I dropped my robe and I got into position. I felt shy and thought, 'It's Tony Bennett, why am I naked?' "