Oil and water don't mix. And neither do Kyle Richards and Carlton Gebbia.
On Monday's Real Housewives of Beverly Hills, the two exchanged ugly words, rather than gifts, at an elegant party to celebrate the birthdays of Kyle's husband, Mauricio, and Lisa Vanderpump's husband, Ken.
And it all started over one of the two things a guest should never discuss at a party: Religion.
What would The Real Housewives of Beverly Hills be without yet another claws-out rivalry?
But according to Kyle Richards, she had no idea newbie Carlton Gebbia had any beef with her – that is, until Richards finally watched the show on TV.
PEOPLE caught up with Richards Friday at the Big Game Big Give Super Bowl Party hosted by Alec Baldwin in New York City, where the reality star said she's been keeping up with the show's current season – and admitted to being frustrated with Gebbia.
The Real Housewives of Beverly Hills was downright spellbinding Monday, as Carlton Gebbia cast a seemingly successful curse on Joyce Giraud after she doubted the self-proclaimed Wiccan's powers.
A day after Gebbia's annual R-rated pool party – a Playboy-esque affair filled with bikini-clad pole dancers, "three-way" candles and tequila shots – Yolanda Foster invited the wives over to help make art to decorate her daughter's room when she leaves for college.
But Gebbia preferred to talk about Kyle Richards instead of painting.
It was all about making a mark on Monday's Real Housewives of Beverly Hills, as Carlton Gebbia got some new ink while Jamie Lee Curtis and Kyle Richards left an indelible impression on Children's Hospital Los Angeles.
Camille Grammer doesn't have to worry about her ex anymore.
Lisa Vanderpump's attempt to mend fences between Brandi Glanville and Joyce Giraud with a reconciliatory dinner at Sur failed miserably on Monday's The Real Housewives of Beverly Hills, with the two nearly breaking bones instead of bread.
"There's this whole one-up thing … everything's a competition," Glanville said before the dinner. "She has to be the center of attention. It's exhausting."
Glanville, 40, attempted to reach out to Giraud, 38, by discussing common friends, but the former beauty queen wasn't accepting her friendship bouquet.
"We have two mutual friends. They don't speak highly of you," said an irked Glanville, words that prompted a fight so loud that Vanderpump's waitstaff couldn't help but watch.