"I have no idea. All I know is that Lo and Steph who were also in Miami thought maybe not you going out with us, it may be that," Audrina says.
"Because I didn't go out with you guys I'm on drugs?" Kristin asks. "That's a pretty intense thing just to assume."
After explaining that even her parents have heard the rumors, Kristin says, "This has become such an issue for me."
"Honestly, I don't know who's done it," Audrina says. "I really don't know if Lo or Stephanie has."
"It's like any time there's a problem, it seems like Stephanie is involved," Kristin says. "I need to talk to them. I just need to get to the bottom of it and end this."
Get ready for another confrontation! The final season of The Hills airs Tuesday (10 p.m. EST) on MTV.