The nip in the air didn’t escape judge Simon Cowell, who joked about it on his Twitter page. He tweeted: “I think the air conditioning is on high tonight looking at Khloe.”
Khloe could also see the funny side.
After a fan account tweeted “I dont get the air conditioning joke..." the 28-year-old joked about the incident.
She said: “I think I had a little nip action earlier LOL. "
Khloe’s fans were quick to comfort her, with one posting: “I've never seen Simon smile so BIG!”
Another wrote: “Simon shouldn't even be looking there ;) LOL”
And big sister Kim was moved to tears as she watched the show.
She tweeted: “Omg!!! I'm literally crying! @KhloeKardashian looks beautiful on the XFactor!!! Not sure why I'm crying, just so proud of my little sister!”