Oprah Winfrey sat down with the entire Kardashian clan to find out if they are really “famous for being famous” or if there is more to them than meets the eye.

After the exclusive interview, Oprah explained that Kim Kardashian’s response to her question about her short-lived marriage to Kris Humphries “levelled” her.

Taking to her Facebook page she wrote: ''Everyone who's asked was the marriage a publicity stunt? Why did she leave after 72 days? Her answer leveled me.''

Oprah further hinted at what can we expect from the one-hour chat saying: ''I genuinely wanted to know why they have become a cultural phenomenon, why so many people love to watch their every move and why so many others love to hate them.

''Are they completely ego centred? Are they really 'famous for being famous' or is there something more?''

''Those of you who watch [Keeping Up With the Kardashians] know they hold nothing back. This interview I'd say was another level of forthrightness and honesty.''

Oprah explained that she had to do plenty of research before the enlightening chat saying: ''I had never met them, nor seen the show. I did a full on Kardashian Kram in preparation, watching major shows from every season.''

The Kardashian interview will be aired this Sunday on Oprah's Next Chapter.