RHOC's Heather Dubrow Eviscerates Katie Ginella in Finale Preview

‘RHOC’ Heather Dubrow Wants to Star in Jennifer Lawrence’s New Housewives Inspired Movie (Exclusive)

Apparently kids are no longer off limits for The Real Housewives of Orange County.

Heather Dubrow and Katie Ginella's feud comes to a contentious head in E! News' exclusive sneak peek at the Bravo series' season 18 finale.

The preview for the Oct. 31 episode kicks off with Emily Simpson addressing the rumor that Katie's daughter Kaili allegedly bad-mouthed Heather while babysitting her and husband Shane Simpson's twin sons Luke and Keller.

"When Kaili came and stayed with my children, she did an amazing job," Emily says in the first look. "Then, when Kaili left, my boys looked at me and they were like, 'Mom, is Heather mean? Kaili told us that Heather's mean.'"

Cut to a flashback of Kaili's version of the story from earlier this season—where she suggests the kids were the ones who brought up Heather.

"So, I went over and babysat, and I was like, 'My mom is friends with your mom. Have you met a lot of your mom's friends?'" the teen recounted to Tamra Judge in a previous episode. "They're like, 'Yeah, but we really don't like Heather, she's mean to our mom.'"

But Emily continues to insist her 9-year-olds were telling the truth.

But when Katie accuses Heather of trying to repeatedly silence her, their beef escalates to a new level of nastiness—and Heather has no problem explaining why she's never liked her new costar.

"Because you're boring and you lie," Heather yells. "That is bulls--t, how dare you? You're so evil."

See the fight continue to play out when The Real Housewives of Orange County season finale airs Thursday, Oct. 31, at 9 p.m. on Bravo.

And keep reading for a preview at the cast's stunning looks for the season 18 reunion, which kicks off Thursday, Nov. 7, at 9 p.m. on Bravo.