'Vanderpump Rules' SURver Scuffle: Stassi Storms Out of Birthday Over Shot From Stripper's Butt

You read that correctly.

While half the cast of "Vanderpump Rules" was busy having fun at Ariana Madix's shindig (she and Stassi share a birthday), the other half was at Stassi's murder-themed soiree. Stassi invited her family and closest friends, which apparently included the New Orleans stripper they hired for Katie's bachelorette party, Arielle. Katie, Kristen and Arielle thought it would be fun to make Stassi take a shot out of Arielle's butt, but Stassi was having none of it -- which might be because she was admittedly "f-cked up on adderall and tequila."

"I don't, I don't -- it's not my thing," Stassi kept insisting. "This is annoying. Honestly, stop. It's my birthday, and what I say goes! I'm not doing that!"

Stassi ended up storming out of the bar, and a confused Katie and Kristen followed.

"Why are you upset?" Katie asked.

"I haven't been able to talk to my boyfriend the whole entire night," Stassi replied.

Katie was still confused, saying, "I didn't think having your boyfriend here was going to--"

"It's not just about that, Katie!" Stassi fired back. "Have I ever once wanted to get a f-cking lap dance or take a shot out of--"

"Yes, at my bachelorette party!" Katie replied. (Cue footage of Stassi getting a lap dance from Arielle at Katie's bachelorette party.)

"I am so f-cking annoyed by how everything turned out," Stassi added.

"You are being a bitch," Kristen chimed in.

"It's my birthday!" Stassi fired back.

"So go f-ck yourself," Katie said.

Stassi ended up storming off, leaving Katie to pay her bar tab and other party expenses, which came out to $1,400.

Stassi later told Bravo cams her outburst was in response to being "really nervous" about her then-boyfriend, Patrick, being at her party given their rocky relationship status at the time.

"Back in the day, I would have chased Stassi down the street," Kristen said during her confessional. "I would have babied the little spoiled princess brat. But you know what, Stas? Your mom, your brother, your boyfriend are all downstairs, and they know better than to chase you own the street. You're 29 years old. You're a f-cking adult. Get a grip. Grow up."

"Vanderpump Rules" airs Mondays at 9 p.m. on Bravo.