And Lala completely loses it.
On Monday's "Vanderpump Rules," Lala and Katie decided to let bygones be bygones, but it came back to blow up in Katie's face at SUR manager Peter Madrigal's birthday party. Lucky for Katie, though, her hubby had her back -- in the best way possible.
At the party, Lala told Katie she felt guilty for being the "main source" of tension between her and Scheana, so she brought the ladies together to make up.
Kristen Doute attempted to insert herself into the conversation, which set Scheana off, which set Lala off.
"ENOUGH! I'M OVER IT! STOP! STOP!" Lala shouted. "I am done with every single person sitting there blaming each other for what the f-ck is going down. So let's -- as a united f-cking front as women -- come together. What the f-ck is going on here?!"
Stassi Schroeder, another former enemy of Lala's, told Bravo cams, "It's kind of great to watch Lala lose her shit. I mean, it's like terrifying, but oddly beautiful at the same time. And it's kind of fun to have a new friend that's f-cking insane."
"I love how Katie's on her redemption tour, like, 'I was such a bitch last year -- I'm gonna just gonna be so nice to everyone,'" Scheana fired back at Lala and Katie. "Are you kidding?! You guys are so f-cking fake! I cannot!"
That's when Tom Schwartz came to Katie's defense.
"Scheana, look at your nails! You're the fakest person in this whole building!" he shouted. "You're fake from head to toe. You have no personality. You're nothing! You're a bootleg Kardashian. All you care about is a f-cking selfie."
"And all you care about is making out with f-cking chicks in bars," Scheana fired back after she sarcastically praised Schwartz for finally sticking up for his wife.
"Come up with some new material, bitch," Katie said to Scheana before walking away.
Ariana Madix later told Bravo cams, "If I wanna give Katie the benefit of the doubt, I'd say she's really working on herself and trying to be a better person, but if I wanna be realistic, I'd say she treated a lot of people like shit last year -- and what better way to revamp her image with this group than to befriend the one person she talked the most shit about?"
"Vanderpump Rules" airs Mondays at 9 p.m. on Bravo.