Pattinson and Stewart - who play lovers in the hugely successful "Twilight" series of films based on the bestselling books by Stephenie Meyer - have reconciled and are living together again, Us Weekly magazine reported, citing an unnamed source.
"Rob really does love her," Us Weekly's Jennifer Peros told "Good Morning America." "He wants to give her a second chance."
The article, which will hit newsstands on Friday, adds, however, that things aren't back to where the used to be. The source claims Pattinson "is extra-sensitive right now. He's insecure."
E! Online and People magazine have also reported that the two have been spending time together. The pair have not been seen together since they split in June, and neither has responded to the new reports of a reconciliaition.
"They're doing everything they can to kind of work on their relationship very privately," Peros said. "We're hearing that they moved into a a new home because, basically, the old place just stirred up too many memories."
Us Weekly broke the news of the affair between Stewart, 22, and Rupert Sanders, the 41-year-old director of "Snow White and the Huntsman." In July, the magazine published several photos of Sanders and Stewart kissing and cuddling -- prompting swift, abject public apologies from both and drawing a backlash from fans of the movies and of Pattinson.
Sanders, 41, is married to model Liberty Ross, 33. They have two children together.
After the news broke, moving trucks were spotted outside the home that Stewart and Pattinson, 26, used to share.
The two starred in the "Twilight" films as the lead characters. Fans were drawn to the story that their on-screen romance carried over into their real lives.
The fifth and final film in the franchise is scheduled to hit theaters in November, prompting some in the media to speculate that a reconciliation could benefit ticket sales.
Pattinson's sisters reportedly have opposed any reconciliation.