Kristen Stewart hurled an expletive at the paparazzi after they wrote "I heart-shape Rob" in the dust on the hood of her car on Monday.

Celebrity videographers filmed Stewart, 23, walking into a parking lot where her dust-covered pickup truck was located. The On The Road actress was wearing a blue baseball cap turned backwards, eyeglasses, a white t-shirt, jeans and sneakers with her usual solemn countenance.

In a video posted on YouTube, a photographer asked the Twilight star, "How's it going?" and when another told her she was "number one" Stewart replied "f-k you" as she jumped in her car.

Mail Online published the photos on Tuesday of Stewart entering her car and spotting the words written by the paparazi on the hood of her dusty vehicle.

According to the report, she was in a business meeting preparing for her upcoming movie, Camp X Ray, which she is scheduled to film soon.

Photos surfaced of Stewart's ex, Robert Pattinson, riding around in his pickup truck with a female who looked like his ex on June 29. Multiple reports said the mystery woman was actress/model Riley Keough. Keough, 23, is the granddaughter of Elvis Presley, the deceased rock and roll icon. Her mother is Lisa Marie Presley, Elvis' famous daughter who was once married to Michael Jackson, and her father is musician Danny Keough. Riley starred alongside Stewart and Dakota Fanning in the Joan Jett biopic, 2010's The Runaways, and in Magic Mike in 2011, alongside Channing Tatum.

"Riley isn't dating Rob," Keough's rep told JustJared, "And I can confirm that Riley was not photographed at all this weekend."

Watch Kristen Stewart's reaction to the prank below.

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Kristen Stewart Robert Pattinson, Robert pattinson kristen stewart