The reality TV star told Heat that she did not understand why her behind is such a topic of conversation.
"I don't get the fact, like, why it's talked about," said Kardashian.
"I don't get it. Sometimes I get bored of talking about it... most women have one."
She added: "There was this thing that said that my butt exploded on an airplane!
"I was like, 'Seriously?!' Where do people come up with this stuff? It's crazy."
This week it emerged that a naked photograph posted online by Kardashian's boyfriend Kanye West was not in fact of her but was of ex-porn star Amia Miley.
In 2011, Kardashian proved that her bottom was not artificially enhanced by posting an X-ray online.