shannon beador packed on the pounds during filming on the 12th season of "The Real Housewives of Orange County" and according to the reality star, it's all Vicki Gunvalson's fault. During a scene from the season 12 trailer, which was released by Bravo TV early Monday morning, Beador blames her troubles on Gunvalson after the pair are heard screaming at one another for the cameras.

"All I want to do is eat," Beador proclaims during filming, via a report by the Daily Mail on June 5. As the trailer continues, Beador blames her weight gain on stress, and as she points at her heavier midsection, she says, "and that is Vicki Gunvalson." She also tells the cameras during a confessional that she doesn't understand how she let herself go.

Shannon Beador and Vicki Gunvalson had a friendly relationship years ago

After Beador joined "The Real Housewives of orange county" during the show's ninth season, along with Lizzie Rovsek, she and Gunvalson hit it off with one another and grew quite close. Then, during season 10, as Gunvalson and her boyfriend, Brooks Ayers, faced allegations of lying about cancer, things between the two women took a major turn for the worse and ultimately, Beador accused Gunvalson of lying about Ayers' alleged cancer diagnosis.

Shannon Beador teams up with Tamra Judge during season 12

As fans can see from the season 12 trailer, Beador and Judge are thick as thieves throughout the season, and when it comes to their disdain for Gunvalson, they appear to be on the same page.

In fact, they are both heard yelling at Gunvalson in the trailer and later come to blows with their co-star during a face-to-face encounter.

'RHOC' season 12 is packed with drama

In addition to Beador's confrontation with her co-star, Meghan King Edmonds is seen going head-to-head with Kelly Dodd after Dodd is seen criticizing Edmonds' decision to involve herself in the ongoing drama between cast members when she should be home with her new baby.

After Dodd made the shocking comment, Edmonds was seen chatting with another one of the show's stars and admitting that it was extremely hurtful to hear Dodd claim that she was a bad mom.

Season 12 also sees the return of Lydia Mclaughlin and Gretchen Rossi.

To see more of Shannon Beador and her co-stars, including Vicki Gunvalson, tune in to the upcoming 12th season of "The Real Housewives of Orange County," which airs on Monday, July 10, at 9 p.m. on Bravo TV.