‘This Nasty B*tch Will Do Anything To Stay Relevant!’: Embattled Tamra Barney Rips Ex-‘RHOC’ Co-Star Gretchen Rossi For Custody Battle Comments

Is Tamra Barney beginning to crack under the pressure of her high-profile custody war with ex-husband Simon?

It would appear so, as the normally-peachy keen reality queen dropped her good manners late Wednesday in a Facebook post, calling Gretchen Rossi “a nasty b*tch” after her former Real Housewives of Orange County castmate chipped in her opinion on Barney’s very public and personal courtroom struggle over her children.

After Rossi told Life & Style she thinks Barney “cares more about ‘RHOC’ than taking care of her kids,” Barney said, “This nasty b*tch will do anything to stay relevant.

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“GO AWAY! You know nothing about my life or my kids. I pray that one day you have the happiness and beautiful children I have. I pray that your children are not hurt by divorce and their names are not dragged through the mud by people like you.”

Rossi was quick to respond via social media, calling Barney a “hypocrite,” and reminding her how quick she was to “trash talk” her beau Slade Smiley when his own dirty laundry was on public display.

Rossi wrote: “so T I'm the evil nasty one? … I didn't even say stuff about your kids … Funny how you always deflect who you are onto me. #lookinthemirror.”

As we has previously reported, Barney vowed on Monday night’s Watch What Happens Live she’s “going to win” the custody battle, which has seen her daughter Sidney call her mother “verbally and emotionally abusive,” as well as “embarrassing” for her on-screen antics, in court docs.

Stay with RadarOnline.com for more on Barney’s explosive custody battle.