Kristen Stewart may be finally done with Robert Pattinson.

Robsten is no more, apparently, as Kristen Stewart has a new love interest, her costar Lane Garrison.

The "Camp X-Ray" duo have been spending a lot of time together...and hitting it off, sources say.

Meanwhile, Rob is likely dating his own costar, Mia Wasikoswka, The "Maps to the Stars" costars are cozying up to each other on the set.

It seems neither Kristen Stewart or Robert Pattinson can keep away from their co-stars.

Kristen Stewart and Lane Garrison have reportedly taken their friendship to the next level

"Kristen was enjoying Lane's company and he was spending a lot of time with her at her home," a source close to the couple said.

Kristen even asked Lane to stay at her home while they were filming, rather than in a hotel.

The source said, "He doesn't live in LA so he moved out of his hotel when they became close and moved into the guest wing of her house in Los Feliz."

In Peter Sattler's drama film, Kristen Stewart will play the role of a young female soldier named Cole. She hopes to go to Iraq....but is shipped to Guantanamo.

There, she meets and falls in love with her superior officer, Sergeant Randy, played by Lane Garrison.

Lane, however, is more of a bad boy than Robbie was. The clean-cut Edward from Twilight is a thing of the past... Lane has criminal records in his past, including manslaughter for killing a 17-year old boy while driving drunk in 2007. He was also accused of hitting his girlfriend, Playboy star Ashley Mattingly.

Kristen's elder brother, Cameron, is worried about her relationship with Lane because of his dark past.

"Kristen's big brother, Cameron, has told her he's concerned about the new relationship, especially since his recent arrest after his jail term," a source said.

So, are Robsten officially a thing of the past? Should Kristen Stewart go for Lane Garrison, or run back to Robert Pattinson? Sound off in the comments below!