Rob Kardashian, you've been served!

Ever since a photographer alleged a month ago that Rob assaulted her and stole her camera's memory card, we've been waiting for the other shoe to drop — and it dropped today in the form of legal papers.

TMZ reports that Andra Vaik is now suing the reality star.

"While this case is still in the preliminary stage," Andra's lawyer says, "it is clear from our investigation that Robert Kardashian’s violent behavior and his use of force towards Ms. Vaik was completely unjustified."

Rob contends that Andra trespassed onto private property to snap the pics, a story corroborated by witnesses, TMZ reports.

The scene of the altercation was a private gym in West Hollywood which is closed to the general public. Somehow Andra managed to sneak into the locked garage and waited for Rob to take his shirt off before firing off the shutter.

Rob is currently trying to lose weight, which explains why he might feel touchy about a paparazzo nabbing shirtless pics.

More as this story develops!

Source: TMZ, TMZ