See the Cast of 'Real Housewives of Beverly Hills' Season 8

The "Real Housewives of Beverly Hills" decide to celebrate the birthdays of Erika, Dorit and Rinna in Sin City. What could possibly go wrong?

On Tuesday's premiere of "The Real Housewives of Beverly Hills," Kyle Richards convinced Lisa Vanderpump to help her plan a trip to Las Vegas with Erika Girardi, Dorit Kemsley, Lisa Rinna and newcomer Teddi Mellancamp Arroyave.

Season 7 left off with quite a bit of unresolved tension between Erika and Dorit (and Dorit's husband, PK) over the infamous PantyGate scandal, which Rinna ended up getting involved with when she accused Dorit of not trusting her husband and having a "coke den" in her home. During the premiere, Richards thought a trip to Sin City was just what the doctor ordered, and Vanderpump reluctantly agreed.

"All of my life, I've been in situations where one friend doesn't like another friend," Kyle said. "I felt put in the middle between Lisa Rinna, Erika and Dorit, and I try not to put myself in that position with my friends anymore. I invite who I want to invite, and whoever's not comfortable -- they don't have to come."

Of course, they all went and Dorit and Erika - who hadn't spoken since the explosive reunion - were the first to greet each other at LAX. Rinna wouldn't travel with the rest of the, but showed up later.

"Let's have fun," Erika told Bravo cams. "I don't wanna fight with anybody. I don't wanna upset anyone. Fresh beginnings."

Let's see how long that lasts.

While on their private plane en route to Vegas, Vanderpump accidentally spilled Chardonnay on Kyle's new Birkin bag, but she got over it in time to room with her in The Palazzo's presidential suite. Friend and former "RHOBH" castmate Camille Grammer joined them as roomie.

After divvying up the rooms, Camille asked Kyle and Vanderpump how Rinna had been getting along with everyone. "I'm OK with her, but I don't know that Dorit can be," Vanderpump said. "It's a recipe for disaster."

Kyle also added she had an awkward interaction with Rinna's husband, Harry Hamlin, who she said told her: "So what are we going to do about your sister? She obviously can't be around this group ever, ever again." She added he was, "really upset about it."

Rinna and Kim went at it all season long last year, after the actress told former co-star Eden Sassoon that Kyle was an "enabler" and her sister was "close to death." It ended in an shocking reunion moment where Kim returned a bunny Rinna gave her for her new grandson and Rinna walked off set.

Tuesday's episode ended with Rinna showing up in Vegas. And while Kim didn't make the trip to Sin City, the sneak peek for next week teased a tense conversation between Rinna and Dorit to come.

"The Real Housewives of Beverly Hills" airs Tuesday nights on Bravo.

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