Khloe Kardashian's nipple makes 'X Factor' debut - New host has wardrobe malfunction

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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