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