They are among fashion's highest paid models, paid thousands to model designer clothes.

But in these rarely seen photos, the only outfit they needed to show off was their birthday suits.

Kate Moss and Gisele Bundchen are among several celebrities featured in a stunning collection of photography which is set to go under the hammer Christie's auction house in New York.

Athletic Giselle Bundchen goes au natural with bronzed skin and tousled locks for this Irving Penn portrait which is part of an extensive private collection being auctioned off by Christie's New York, next month