Rob Kardashian has just been sued for allegedly assaulting a photographer and stealing her camera equipment ... as she was lying in wait to get pics of the shirtless wonder.
TMZ broke the story ... the photog filed a robbery report last month, claiming Rob jacked part of her camera at a West Hollywood gym ... and she claims it was all because she snapped shirtless pics of him.
The photog -- not a TMZ employee -- says Rob, who is neck deep in a weight loss program, snatched the memory card out of the camera.
Andra Viak's lawyer, George Gallegos, tells us, "While this case is still in the preliminary stage, it is clear from our investigation that Robert Kardashian’s violent behavior and his use of force towards Ms. Viak was completely unjustified.”
For his part, Rob says he lashed out because the photog trespassed onto private property to take the photos. Witnesses back Rob up ... saying the photog was in the garage ... hiding in her car and then making her move when Rob took his shirt off.
9:59 AM PT: An eyewitness tells TMZ the photog had actually driven her car inside the garage and was lying in wait when Rob started changing and then suddenly leaned out of the car window to take the pictures.
Rob Kardashian stole a photog's camera memory card Wednesday because she dared to trespass on private property where he was changing his clothes ... at least that's what Rob is telling friends.
TMZ broke the story ... Rob manhandled the photog and snatched her camera's memory card from her. The cops have launched a robbery investigation.
As for why Rob did it ... he's telling people he had just gone to a private, West Hollywood gym owned by famed trainer Gunnar Peterson.
Rob is telling friends he was changing into his gym clothes inside the garage ... in an area that is not visible from the street. Rob claims the photog somehow entered the garage -- which is caged off to the public -- members must get out of their car and enter the code to get inside.
Rob says as he was changing, he noticed the photog inside the garage, snapping pics. It's unclear how the photog got through the cage.
Someone who manages the gym told TMZ ... they train big celebs and the photogs have a custom of waiting on public property to get their shot. That makes sense, because the code to the cage presumably keeps non-members out.
FYI ... Rob's story almost certainly does not create a defense to robbery, but prosecutors may back off if a jury would be inclined to hate the victim.
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.