Portraits of models in the buff seem to be fetching an mind-boggling amount at auction right now, take that photo of Carla Bruni for instance. So just how will an image of a bare-breasted Gisele Bundchen smoking go for these days?

That's the question the folks over at Christie's are asking right now as this picture of the Brazilian supermodel goes under the hammer next month.

Taken by photographer Michel Comte, Bundchen's picture currently holds a price guide of £6,000 to £8,000. However since a recent portrait of her sold for £98,000 at auction, Comte's image is expected to smash the expected price range.

Bundchen's image is one of several which form part of the Photographs sale. Another model to be featured in the collection includes Kate Moss, in a black-and-white picture taken by Albert Watson.