We all know that a naked photo of Carla Bruni-Sarkozy is bound to fetch a fortune at auction, but for how much? That is what many are asking after another black-and-white photo of the supermodel in the buff goes under the hammer in Berlin next month. Taken by US photographer Pamela Hansen in 1994, Carla was just 26, at the height of her modelling career and dating Mick Jagger. But the real question is - will the rolling-between-the-sheets pic surpass the £60,000 paid for her last nude portrait?