Matthew McConaughey -- Wasting Away ... For New Movie Role

Matthew McConaughey is usually known for flaunting his buff and topless torso, but it was his startling gaunt new look in NYC on Thursday that had everyone's jaws dropping.

The 42-year-old is drastically losing the pounds to play Ron Woodruff in the movie "The Dallas Buyer's Club," the true story of a man who contracted HIV through drug use in the '80s and has to smuggle life-saving medications from Mexico.