Kristen Stewart arrived at her dirty pick-up truck on Monday, July 8, only to find a message written in the dust and grime on her car.

That message? "I <3 Rob" -- clearly a dig about her former 'Twilight' co-star and current ex-boyfriend Robert Pattinson. Yikes.

The words, possibly written by a fan or more likely a paparazzo trying to get a rise out of Stewart, definitely put an even bigger frown on her generally dour face. (Let this be a lesson: Don't mumble insults at the press.)

Stewart was reportedly fixated by the message as she walked to her car. Us? We'd be more upset about that piece of paper that looks like a parking ticket.

But seriously, KStew. Get thyself to a car wash.