Britney Spears will reportedly appear nude in an American magazine - if a slim body double for can be found. Blender magazine want to replicate a Bert Stern picture of Marilyn Monroe in bed, but bosses fear the troubled singer is too overweight - so they want to merge a model's slender body with Spears' head. An advert in the publication reads, "We are casting for a Britney Spears body double. You must have shoulder to medium-length blonde hair. This person must also be in shape. "Your face will not be shown in the final photograph/cover."