The Real Housewives of Orange County Season 13 is gearing up to be the nastiest season in the history of the show! In the shocking trailer that just dropped, all past alliances are off between returning housewives Shannon Beador, Tamra Judge, Vicki Gunvalson, and Kelly Dodd. But Breaking Celebrity News has exclusively learned that they aren’t the only ones bringing some serious scandal to the upcoming season as newbie’s Emily Moore Simpson and Gina Kirschenheiter are definitely giving the fabulous four a run for their money.

And show addition Gina Kirschenheiter is no walk in the park, either! In the trailer, the blonde New York native blasts cast mate Beador at dinner! “You sound stupid! I don’t do stupid,” Kirschenheiter told her new nemesis. But behind the scenes, Breaking Celebrity News has learned that Kirschenheiter is not as controversial as she is portrayed to be in the sneak peek! “Gina is actually quite boring and she doesn’t really mesh well with the others," the source said. "She is trying to hard and a lot of her scenes needed to be cut out because she simply isn’t that interesting."

Needless to say, Dodd, 42, still brings all the drama. As Breaking Celebrity News reported, she got into a bitter battle with her co-star, Gunvalson, several months ago over the fact that Gunvalson allegedly set up Dodd’s ex-husband Michael with her friend! And Dodd lets her have it in the new season during an all-out crying and screaming blowout brawl. But that isn’t all! According the the source, “Kelly is out of control since her split and her partying hasn’t slowed down either.”

And then there’s 54-year-old Beador. The trailer shows scenes of her non-stop breakdowns over her cheating ex-husband, and Breaking Celebrity News has learned that is just the tip of the iceberg! “Shannon goes through a complete metamorphosis and gets into fights with nearly every cast member,” the insider told Breaking Celebrity News.

Shockingly, trouble-starter Judge, 50, is very low-key this season when it comes to confrontation. As Breaking Celebrity News recently reported, Judge’s hubby, Eddie, was hospitalized for the fifth time as he struggles to overcome a dangerous heart condition. “I’m so scared for my husband,” Judge reveals in the trailer.

Although 50-year-old Gunvalson’s feud with Judge ended last season, she still finds her fair share of catfights with the other women! In the teaser, Gunvalson’s relationship with her boyfriend, Steve Lodge, turns ugly as the veteran housewife is pushing marriage on him! According to the source, “Vicki is so overdramatic and although she says she is done, she is never really done.”