E! News exclusively learned that Kristen and Rob spent four hours yesterday at the house he's been renting in a gated community in Beverly Hills, after which they tried to take the show on the road.
Rob, behind the wheel of his silver Jeep, was seen trailing Kristen's blue Toyota pickup truck out of his neighborhood, the actress giving the occasional glance in the rearview mirror.
But whatever their plan was, they seemed to have a change of heart once they noticed that they had picked up a paparazzi shadow.
Rob turned his SUV around and headed back toward his house, leaving Kristen to give the photographer a piece of her mind without saying a word.
To be continued.
That's OK, we've seen the On the Road star flip off the paparazzi before. Who can blame her?
As for those close to the former onscreen and real-life couple, who dated for about three years before breaking up in May, a source exclusively told E! News today that Rob's friends are completely surprised that the exes are in touch.
The Cosmopolis star is incredibly focused on his career at the moment, he's been working out hard to get himself into top condition (we've noticed!) and he doesn't want distractions, according to the source.
But that does jive with what we're hearing from another insider, which is that Rob is once again comfortable with Kristen but isn't looking for love—with her or anyone else at the moment!
"Rob is single. He doesn't want to date anybody right now," that source told us. "Not Kristen, not anyone. He is really enjoying his life. I honestly believe they will not get back together. There is always a small chance something happens, but I highly doubt it."
As for the pair familiarly known as Robsten, "there was lots of animosity after the split, but as time moved on they moved on and they gradually got over it. They are cordial now."
Aside from these accidental sightings, the source believes that we won't be seeing Rob and Kristen out in public together anytime soon.
But, the insider added, since they share so many pals, their rekindled friendship should make run-ins at parties and elsewhere less awkward.
Kristen, whose next film is the Guantanmo Bay-set drama Camp X-Ray, was in Europe for much of the summer, traveling and shooting the drama Sils Maria.
Rob got to stay close to home to shoot director David Cronenberg's latest, the Hollywood satire Maps to the Stars.
—Reporting by Michelle Falls and Baker Machado
Tune into E! News tonight at 7 p.m. & 11:30 for more photos and all the scoop on Rob & Kristen's reunion