Speaking exclusively to Life & Style, the 34-year-old revealed filming the Season 5 reunion show was "really frustrating" and called out co-stars Jax Taylor and Scheana Marie.
"Jax likes to put attention on himself," she said of the drama he stirred up during the season. "When he gets bored, he likes to gossip."
As for former BFF Scheana, Kristen takes issue with her now claiming to have struggled with anorexia.
"It infuriates me that Scheana is making it a thing," Kristen explained.
While her co-stars might be on the receiving end of some harsh words, Kristen recently opened up about her new boyfriend, Brian Carter, and only had good things to say.
The couple sparked engagement rumors earlier this month, but it turned out to just be an April Fool's joke.
"I also have a great boyfriend and a stable relationship — finally," she told AOL. "He's such a great support system, and I really think that helps me a lot."
She continued, "He's not used to sharing his whole life on camera, whereas, for us, it's easy because we've been doing it for five seasons now. For him, it was kind of a crazy thing to have to jump into."
As for Jax and Scheana, they are focused on life post-reunion, with Jax, 37, starring on a Bravo spin-off with girlfriend Brittany Cartwright and Scheana, 31, rebounding with Robert Valletta following her divorce from Mike Shay.
For more exclusive celebrity news, pick up the latest issue of Life & Style, on newsstands now. And for a look at how much the cast has changed since Season 1, click through the gallery below!