Robert Pattinson was spotted heading into Kristen Stewart's house in Los Angeles and parked his car there for a while over the weekend. Rumors are circulating that they two are getting back together, but sources say Rob and Kristen are still official in their break up.

Robert, 27, and Kristen, 23, have reportedly been spending time together over the weekend since Thursday. X17online.com reports that Rob's car was seen parked in front of her house.

"Rob looked nervous on his way to visit Kristen," a photographer told X17. "He was trying to be discreet so no one would see him."

Rob wore a baseball cap backwards on his head, and sunglasses to hide his face, but his features were still distinguishable in the photographs by X17online.com.

However, Perez Hilton says a source reveals the couple is not getting back together, despite these tell-tale signs of a reconciliation.

According to Perez, a source said: "Rob initially reached out to Kristen because he wanted to stop by and pick up the rest of his stuff, but apparently he also wanted to see her. He stopped by on the weekend and they both spent some time together, catching up. Kristen was really happy to see him, but I think in the end they were both sad because they still have feelings for each other. It's not as simple as just getting back together. Seeing each other brought up a lot stuff for both of them. For now, work - not rebuilding a relationship - comes first. It's sad."

Pattinson broke up with Stewart after four years of being together. Rob reportedly struggled to forgive Stewart after she cheated with her "Snow White and the Huntsman" director and then-married Rupert Sanders, HNGN reports.

Sources have since said Pattinson is hooking up and hanging out with the 24-year old granddaughter of Elvis Presley, Riley Keough.

"[Riley's] the first girl he's liked since Kristen," a source told US Weekly of Pattinson's new girl. "[They're] having a lot of fun."

However, sources have previously said they are "friends with benefits," and are not very serious at the moment.