Brad Pitt -- Takes a Licking ... (PHOTO)

Brad Pitt's face is indestructible -- a fact whoever (or whatever) hit Brad should have known before attempting to disfigure our national treasure.

Brad showed up for a charity event in Hollywood Saturday night with a big bruise that starts under his left eye, and trails under his nose.

Most people would've stayed home with that kind of scarring, but most people don't have BP's genes. No clue what's behind this crime against beauty -- we've got a call in to his rep.