Khloe Kardashian and Mario Lopez made their 'X Factor' hosting debut, but a third party got all the attention -- Khloe's nipple.
Simon Cowell told Khloe on air, "May I say, Khloe, you're looking very sexy tonight. I think the air conditioning's on high tonight. It's very distracting."
The hosting newbie wore a sheer purple blouse, driving the family show into slightly NSFW territory. She later tweeted, "I think I had a little nip action earlier LOL."
Photo/Video credit: X Factor USA