Matthew McConaughey isn't the only bag of bones on the set of "Dallas Buyer's Club."

Co-star Jared Leto is also wasting away for his role in the film -- he and photographer Terry Richardson shared some scary, shirtless photos of his shrinking physique.

The actor, who also waxed his eyebrows, revealed he's fasting to play a transsexual and told Vulture he hasn't eaten in almost a month.

"Your body goes through weird stages," he says of the weight loss. "Sometimes it's hard to hold on to water. But for me, it's not about the most weight I can lose, it's more to represent the character."