Baring all for Bennett was nerve-wracking: Lady Gaga

London: Pop sensation Lady Gaga says her decision to pose nude for legendary crooner Tony Bennett as he sketched her was one of her most "nerve-wracking" moments.

The `Bad Romance` singer was persuaded to disrobe for Bennett - an acclaimed artist, by photographer Annie Leibovitz for a Vanity Fair photoshoot with the pair who teamed up to record a duet, Daily Express reported.

"True to form, as me giving my all to my work (sic), I walked in and I said, `Well, Tony, here we are...` and he started laughing and I dropped my robe and I got into my position. It was very, very nerve-wracking.

"I felt shy, it`s Tony Bennett. Why am I naked...? The first thing that Tony said to me when I saw him (afterwards) was, `Wait `til you see this sketch I did. It`s amazing. You look beautiful,`" she said.

And the 25-year-old singer admits it was a huge moment in her career because the `I Left My Heart in San Francisco singer` is such a legend to her.

The sketch and the Leibovitz photo session appears in the January issue of Vanity Fair magazine.