Rob Kardashian allegedly just jacked a photog's camera equipment ... law enforcement sources tell TMZ -- and according to the photog, it was all because she snapped shirtless pics of the reality star.
The photog -- not TMZ -- filed a robbery report this afternoon, telling cops Rob snatched part of her camera and took off.
The photo agency says Rob went berserk because he wasn't wearing a shirt when the photographs were taken ... snatching the camera's memory card so the photos wouldn't get out. The agency says Rob then took off, promising to pay for the card later.
FYI, Rob's in the middle of a big weight loss program ... and he's obviously trying to keep his bulge under wraps. Police are currently investigating.
Calls to Rob weren't returned.
Rob Kardashian Accused of Robbing Photog Over Shirtless Pics
3/27/2013 6:04 PM PDT BY TMZ STAFF