Rob, Kristen in Custody Battle ... Over Dog

Robert Pattinson and Kristen Stewart are gearing up for an ugly custody battle … over a dog. Back in the halcyon days before Stewart cheated on Pattinson and broke the hearts of Twi-hards everywhere, the couple adopted a mutt named Bear from a shelter in New Orleans. "Rob was so hurt by Kristen’s actions he decided that he wants the dog to help him get over what happened," an insider helpfully tells Radar. "After all, a dog is a man’s best friend and Bear is such a good companion." But Stewart nursed Bear through Parvo and won't give him up easily.

"She was heartbroken—they adopted Bear together and she always felt that he was their little baby," the insider continues. "She wants joint custody—and it could get a little messy." At least Kristen will get to keep her cat, Max. In other "RobSten" news, Hollywood Life reports that Pattinson actually drove Stewart to cheat. Kristen was jealous when Rob got close to Emilie de Ravin, his co-star in 2009's Remember Me. She "found it difficult to cope with Rob being close friends with another woman," a source says, despite the fact that Rob never got romantic with Emilie. As for the other couple involved, cheating director Rupert Sanders is still wearing his wedding ring. (More Robert Pattinson stories.)