Oprah Talks Kardashian Interview: Kim's Reason For Ending Marriage 'Leveled Me'

Access Hollywood
Oprah with the Kardashian/Jenner family -- Facebook

Oprah Winfrey surprised many fans by interviewing the Kardashian family for OWN's "Next Chapter," and the queen of talk took a moment to explain why she chose to go behind the scenes with the reality TV brood.

"Ok my friends I had the longest interviewing session I can ever recall, talking to ALLLLLLLL the Kardashians," Oprah said in a post published on her Facebook page on Wednesday. "I had never met them, nor seen the show. I did a full on Kardashian Kram in preparation, watching major shows from every season.

PLAY IT NOW: Oprah Makes Nice With 50 Cent

"I genuinely wanted to know why they have become a cultural phenomenon? Why do so many people love to watch their every move and why do so many others love to hate them," the post continued.

The sit-down yielded plenty of intriguing material, Oprah revealed, including shocking revelations from Kim about her ill-fated marriage to basketball star Kris Humphries.

VIEW THE PHOTOS: ‘The Oprah Winfrey Show’s’ Top 10 Celebrity Moments

"Everyone who's asked was the marriage a publicity stunt? Why did she leave after 72 days? Her answer leveled me," she wrote.

Additionally, Oprah said she received answers to all of her questions and "more," noting that while the Kardashians are known for their transparency on camera, the family approached the interview with "another level of forthrightness and honesty."

Catch Oprah's interview with the Kardashians on Sunday at 8/7c on OWN.

VIEW THE PHOTOS: Hollywood’s Biggest Broods

--Erin O'Sullivan

Copyright 2012 by NBC Universal, Inc. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

VIEW THE PHOTOS: Reality TV’s Brunette Bombshell Kim Kardashian!