The sketch that crooner Tony Bennett made of pop icon Lady Gaga was put up for sale yesterday, December 12. 

The 'Marry The Night' superstar opened up about her decision to pose for the singer and artist during her recent Thanksgiving special, 'A Very Gaga Thanksgiving', and explained:

"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?'"

The piece of art, which immortalises Gaga laying on her stomach while looking straight on and smoking a cigarette, has been listed on the newly launched eBay Celebrity and is open for public bids now. 

Billboard.com explains that all proceeds from the auction will be donated equally to Exploring the Arts founded by Bennett and The Born This Way Foundation, founded by Gaga.