Simpson, who was then 30 years old, showed up without a football or a jersey, and Warhol had to scramble to find a ball. That Polaroid shoot led to eleven silkscreen portraits, and one of which is now being on auction block for the first time. It's signed by both men, the portrait is billed by the auction house as a work that brings together two of the most recognizable names of the 20th century and captures a trajectory of celebrity and tragedy