Kristen Stewart may be trying to move on from her on-and-off-again romance with “Twilight” co-star Robert Pattinson, but not everyone seems to share her mission. On Monday, the 23-year-old actress reportedly lashed out at photographers who camped outside her parked pickup truck and captured her reaction to a Robert Pattinson-themed prank.

According to Entertainment Wise, Stewart was inside a Los Angeles studio on Monday, when an anonymous prankster scrawled “I <3 Rob” across the dusty hood of her Toyota pickup truck, which was parked outside. When Stewart returned to her vehicle, clad in her signature jeans, T-shirt and backward baseball cap, paparazzi snapped away. Stewart in turn looked “unamused” and reportedly swore at photographers under her breath before driving away.

Pattinson and Stewart, who dated off and on for nearly five years, reportedly broke up again in May. Although the two have been spotted out together holding hands since the breakup, Pattinson, 27, is rumored to have already moved on from the relationship. The “Cosmopolis” star was most recently spotted with Kristen Stewart doppelganger Riley Keough, a 24-year-old model and actress and the granddaughter of Elvis Presley.

The two were photographed in late June, driving through Los Feliz, Calif., in Pattinson’s Chevy Silverado truck. Reports surfaced soon after that Keough and Pattinson were an item, with a source for the Daily Mail alleging that the two were engaged in “short-term lust right now rather than long-term love,” and were planning to celebrated the July 4 holiday together.

“They're inseparable. Rob loves the fact that Riley is Elvis's granddaughter -- that's true Rock'n'Roll royalty in his eyes,” a source told the British tabloid. But the publication also noted that Keough was simply a friend of both Stewart and Pattinson’s. Keough and Stewart starred in “The Runaways” together in 2010.

Soon after the reports began circulating, a rep for Keough released a statement denying the relationship, adding that the mystery redhead in Pattinon’s car had been misidentified as Keough. “Riley isn’t dating Rob. And I can confirm that Riley was not photographed at all this weekend,” Keough’s rep told Just Jared.

A friend of Pattinson’s who spoke to E! News also denied that not only were Keough and Pattinson not an item, but Pattinson was not looking to get romantically involved with anyone just yet. "Rob is just enjoying hanging and chilling with friends at this point in his life," the source said. “[He] isn't dating anyone at the moment, but he is very open to it.”