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Old Habits Die Hard! Mischa Barton ‘Hated’ By 'The Hills' Costars ‘She knows the only way to stay relevant is by starting fake fights,’ says source.

Old habits die hard!

The Hills reboot is set to premiere in less than a month and RadarOnline.com can exclusively reveal that Mischa Barton has already made some serious enemies on set!

According to a production source, Mischa, 33, “starts a lot of fake fights” with her co-stars, which include original cast members Heidi Montag, Spencer Pratt, Stephanie Pratt, Audrina Patridge , Whitney Port, Jason Wahler and Frankie DelGado.

“Whitney and Audrina are really just over her and they do not understand why she is on the show to begin with, considering she was not on the original,” the insider added.

INSIDE MISCHA BARTON’S $500,000 SEX TAPE DRAMA

Mischa starred in Fox’s The O.C. which inspired reality show spin-off Laguna Beach after it ended.

Since her stint on O.C., however, she’s gotten arrested for a D.U.I, spent time in a psych ward, sued her mother, overdosed on drugs and got caught up in a scandal over a leaked sex tape.

“She gets into it a couple of times during filming over her leach-on boyfriend James. Everyone believes that he is only with her for fame, but she won’t listen. She thinks that the other girls are just super jealous of what she has,” the insider added.

PHOTOS: HOT MESS MISCHA BARTON STRIPS DOWN AMID REVENGE PORN SCANDAL

In 2017, Mischa started dating Australian model James Abercrombie, who’s family fortune is estimated to be $500 million.

But it seems that Mischa is only hated by cast mates, as MTV networks are raving over the troubled actress’ on-screen antics!

“There’s no reason there can’t be five more seasons of this,” a source previously told Radar. “Bosses are loving what they’re seeing so far.”

The Hills: New Beginnings premieres on June 24.