Fans of her reality show know that nothing comes between Khloé Kardashian and her sisters, Kourtney and Kim. On "When I Was 17," a new MTV show premiering Saturday at 11 a.m. (and also featuring Trey Songz and Perez Hilton), they'll get to see just how true that is. Khloé explains how she took matters into her own hands when she realized she'd be the last of the trio to graduate high school.

"My sisters were my best friends. We all went to an all-girls Catholic school," Khloé remembered. "When my sisters graduated, I felt I didn't have friends. There was no reason for me to stay."

To ensure she'd never have to endure a single day of school without her siblings, Khloé got creative. Registering herself for homeschooling seemed like the best solution, she said. "And I was kind of a shady kid," Khloé recalled. "So I located a home school. I went there, I enrolled myself. I had my parents sign, [but] I really signed."

To her mom, Kris, the decision seemed to come out of left field. "One day I get a call from the school, asking me about these forms I had filled out and signed transferring Khloé," mom Kris Jenner recalled. "And I was like, 'What the hell are you talking about? Khloé's not going to home school.' Somehow, she convinced her dad and I that's where she belonged."

Her parents caved and gave their permission — with one condition. "She said as long as I really did my school work I could do it," Khloé explained. "I finished three years of high school in one year. I graduated actually when I was 17, with honors. So — in your face!"

"When I Was 17" — this week featuring Trey Songz, Khloe Kardashian and Perez Hilton — premieres Saturday (May 1) at 11 a.m. on MTV.