Kristin Cavallari has some words of wisdom to the cast of The Hills: New Beginnings.

While attending her Uncommon James pop-up shop in Los Angeles, the jewelry designer/reality star divulged to ET what the new cast needs to do (or more like, doesn't need to do) for the reboot to succeed.

"They don't need any advice, they know what they're doing!" Cavallari exclaimed. "I'm excited to see The Hills, too, and just be a viewer like everybody else. There's a little part of me that's sad I can't be part of it."

The 31-year-old won't be a part of the new series due to filming her own reality showVery Cavallari. The original show's main character, Lauren Conrad, also won't be returning. However, the reboot will still be filled with familiar faces including Heidi, Spencer and Stephanie Pratt, Audrina Patridge, Whitney Port, Justin Bobby, Jason Wahler and Brody Jenner. Stars like Mischa Barton and Brandon Lee—the 22-year-old son of Tommy Lee and Pamela Anderson—have also joined the cast.

"Buckle up, baby!" Cavallari said. "That's going to be a wild ride."

Filming for The Hills: New Beginnings has already begun, and its set to debut sometime in 2019.

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