(CNN) -- Two photographs of Madonna set to appear in a Christie's auction next month will probably sell for at least $10,000 each, according to estimates posted on the company's Web site.



Christie's will auction a nude photo of Madonna (partially shown above) taken by Lee Friedlander.



One, a full-frontal nude black-and-white photograph of the singer, was taken in 1979 by celebrated American photographer Lee Friedlander for a series of nudes he was working on, said Milena Sales, a spokeswoman for the auction house.



Madonna was about 20 when the photograph, one of several, was taken.



A handful from the shoot appeared in Playboy magazine in 1985, Sales said. Christie's put price estimates for the photograph at $10,000 to $15,000.



The second photograph of Madonna was taken in the 1980s by Helmut Newton.



In the Newton photograph, which is in color, Madonna is wearing a short dress and black stockings with garters. The circumstances behind the photo shoot were not immediately clear.



The auction will take place in New York on February 12.
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