“Jessica is acting like a spoiled brat,�? a source told The ENQUIRER. “She throws tantrums and gripes about the heat. After a week of having to tolerate her, we’re all ready for her to pack her bags and hit the road.�?

Styled after the Goldie Hawn hit “Private Benjamin,�? the comedy stars Jessica as a down-on-her-luck movie star who enlists in the U.S. Army. It’s being filmed at the Camp Minden National Guard training base in Louisiana.

Jessica has stunned the crew with her rude behavior, including dropping the F-bomb, say sources.

“Jessica barely speaks to her co-star, Vivica A. Fox, and insists on eating by herself in her trailer rather than in the tents set up for the cast and crew,�? disclosed the source.

“And while Vivica and everyone else walk the set, Jessica has a driver ferry her from one location to the next – even if she only has to walk 100 feet!�?

Jessica has four assistants – and she reportedly flew into a rage one day over a wardrobe issue and threw a shoe at one of them.

While filming an obstacle course scene in the broiling Louisiana sun, Jessica had a complete meltdown, said the source.

“She went on a loud tirade, screaming at the wardrobe people because her outfit was too hot and she was sweating,�? revealed the source.

“She spouted the F-word like a sailor. Her F-bombs were heard practically all over the base. Everyone was mortified.�?

Jessica’s publicist denies that she caused any problems on the set. But the source says that in another incident, Jessica failed to attend a graduation party for about 300 National Guardsmen who’d completed their basic training.

“Many of the soldiers were getting ready to be shipped off to the Middle East,�? said the source.

“Vivica came to the party to talk with them, sign autographs and pose for pictures, but Jessica never showed up. It was very disappointing.�?