A photo depicting a carefree Jolie will be part of The Wild Side of Photography sale at London auction house Christie's next month. The picture, fittingly titled "Horseplay," is an outtake from a 2001 David LaChapelle shoot for Rolling Stone. In the stunning shot, Angelina can be seen tossing her head back as she poses with a horse that’s nuzzling her, and not much else. In the photograph, Jolie's "Billy Bob" tattoo (referencing her then-husband Billy Bob Thornton) is clearly visible. Christie's estimates the photograph could sell for close to $53,000. cr:yomg