Kathryn Dunn was evicted from the Big Brother house on Thursday night, and now she's opening up about betrayals and the extent of her pre-game relationship with Holly Allen in an interview with Big Brother host Julie Chen.

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Kat, a 29-year-old digital marketing executive from Irving, TX, who currently resides in Dallas, TX, was evicted from the Big Brother house through a 6-1 vote instead of Cliff Hogg, a 53-year-old petroleum engineer from Houston, TX, during Thursday night's live eviction episode of Season 21 on CBS.

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Nick Maccarone, Analyse Talavera, Nicole Anthony, Holly Allen, Jackson Michie and Christie Murphy all voted to evict Kat from the game, while Jessica Milagros was the only person who voted to oust Cliff.

Kat appeared hurt and blindsided when she left the house, as she chose to hug only Jessica on her way out. Considering Kat had formed many friendships in the house, her cold exit was very telling.

During her post-eviction interview with Julie, Kat admitted her mind was "blown" by her ouster.

"I thought I was going to come in and be, like, the [Tyler Crispen] of my season. I had my plan and it all just went haywire because I was on the block for... the first two weeks," Kat shared.

She also exposed some of the players in the game, saying Nicole was "so wrapped up in Nick," although he had allegedly disrespected her numerous times and played a flirtatious and "skeezy" game.

Kat added that Cliff was "a deal-maker" and a "savage" player.

"He doesn't care about anything but himself in the game, yet they still think I'm the bigger threat, I guess," Kat told Julie, adding that she thought Christie was running the house.

And Kat also finally confirmed whether or not she knew Holly prior to entering the Big Brother house.

"Yeah," Kat said. "Was that a surprise to everyone? Because I think we even surprised the people on the show."

"Explain how you know Holly and, more importantly, how well you knew Holly before the two of you were in the house," Julie requested.

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"So we both competed in pageants," Kat replied.

"I don't know if she brought this up, but she's a former Miss Wyoming USA, and we even have a picture together. Man, I'm giving away all my cards, but whatever!"

Kat said she has a picture of herself with Holly from 2013 when Holly was wearing her sash and Kat was just a big fan.

"I wouldn't say we were necessarily friends, but it's definitely more of a, like, I know you well enough to know that you're a good person and I know your character. It was nice to have that familiar face in the house," Kat explained.

After Julie asked whether the pair hung out socially before the game, Kat clarified, "We have friends in common but we weren't, like, 'friends friends.'"

"We didn't know anything about each other, other than pageant stuff or we've both modeled for different energy drinks -- random stuff like that we have in common."

Whom would Kathryn vote to win Big Brother and what were her goodbye messages?! Watch Kat's interview with Julie below!