Josie Bissett has only been back on Melrose Place a short time and already there are catfights in the courtyard - and we're not talking about the soap's scripts! Insiders tell STAR that Josie, who is reprising her role as Jane Mancini this season, has been infuriating series star Heather Locklear (Amanda) with her demands. "Josie's being a real prima donna and Heather can't stand it," says the source, who watched Josie stop a scene she was doing with her real-life husband Rob Estes (Kyle) and Heather because she thought the dialogue was far-fetched. "Heather became so enraged at Josie's audacity that she stormed off the set," says the setsider. "Then she told (producer) Aaron Spelling that she doesn't want any more scenes with her stuck-up co-star." New mom Heather was already annoyed with Josie for keeping everyone waiting while she finished up an herbal beauty treatment. And she resents that Josie is getting perks that used to be reserved for Heather alone, like a double to stand in while scenes are being blocked. Talk about life imitating art!