"I was a major trouble maker," the reality star says in a preview clip posted on her Web site for the new MTV show, When I Was 17, airing May 1. "I was a bad, bad girl."
Case in point: Taking her mom's new Range Rover for a joy ride after her parents had given her a used Chevy Tahoe when she got her license. "I was such a brat. I wanted a new car," she remembers.
Begrudged, she took the $80,000 car to a party, dropped it off at a valet stand and a few hours later, got approached by a frantic valet.
"I remember my friends and I saw this car on fire and we were like, 'Whoa, that person is screwed!" she says. "And then I was like, expletive that's my car."
But that wasn't the only trouble Kardashian, 25, got into. After older sisters Kourtney and Kim Kardashian graduated from their all-girl Catholic school, Khloe says she "felt like I didnt have any friends. There was no reason for me to stay."
"I was kind of a shady kid, so I located a home school," Kardashian says in another promo clip, "I went there and I enrolled myself."
After forging some paperwork so she could transfer out of the high school, the reality star convinced her parents "that's where she belonged," recalls mom Kris Jenner.
Does she regret making that decision? Nope. "I finished three years of high school in one year," Kardashian says proudly. "I graduated actually when I was 17 with honors, so in your face!"