Kardashian made her hosting debut on the talent competition last night (October 31) alongside fellow new presenter Mario Lopez.
© Fox / Brian Dowling
However, her sheer top quickly became a topic of conversation on social networks and judge Simon Cowell made a comment during the broadcast, suggesting that her nipples were on show.
Cowell also took to Twitter to joke about the incident, saying: "I think the air conditioning is on high tonight looking at khloe."
Kardashian has since laughed off the remarks, telling a fan: "I think I had a little nip action earlier LOL."
She later told another follower: "How crazy that I had no idea until those lights turned on! Ha! Of course it happens to me."
Photo gallery - The X Factor USA's first live show:
Copyright: Fox Brian Dowling
Kardashian did say that she was enjoying her new gig, posting halfway through the broadcast: "I must say I LOVE LOVE LOVE my new job!!!"She also thanked her followers for "giving [her] courage to do this" and praised Lopez, saying: "You made me feel at home! You are the best."
The X Factor continues tonight (November 1) on Fox.
