Cast members of MTV's The Hills are all grown up, and now star Kristin Cavallari is the most recent cast member to out the show as a complete fake.

It has been more than three years since the reality series' last episode aired, so Cavallari had no problem revealing that much of the drama on the show was bogus.

"I faked relationships, faked fights. I don't care anymore -- I can tell you," she told Bethenny during an appearance on the talk show Friday.

Cavallari said that one fake story line was her relationship with Brody Jenner. While they dated when Laguna Beach (another hit MTV reality show that she starred in) ended, she and Jenner were not a couple on The Hills like they appeared to be.

"[Jenner] at the time was dating Jayde Nicole...They had [me and Brody] 'dating' for a few episodes. They pretended that him and Jayde broke up and I was dating Brody, and Jayde and I got into a huge fight because she saw us in a club. It wasn't real at all. They were together the entire time," she said.

While fans and viewers of the show might feel bamboozled, that's not all. Cavallari also confessed to playing up the character she was given while on the show.

"When I decided to join The Hills, I knew exactly what I was getting into...I said, 'Listen, I'm game. What do you want me to do?'"

Cavallari also noted another cast member who got into character on the show was Heidi Montag.

"I think she just got caught up in the hype, which is easy to do. When I was 18, I probably got caught up in the hype a little bit, too. But she's still the same person inside. I still talk to Heidi all the time."

Cavallari also said that Montag is also a very sweet person and a nice woman.

The Hills aired on MTV from 2006-2009.

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The Hills, Kristin Cavallari