Lopez joined the other Fox singing competition show last season as host, alongside Kardashian. Despite being at ease in front of the cameras when they're connected to the E! network, Kardashian couldn't quite get comfortable in her role as host -- her misgivings were recently chronicled in an episode of "Kourtney & Kim Take Miami."
"Khloe Kardashian will not be returning to co-host 'The X Factor,'" read a statement attributed to "X Factor" producers. "We really enjoyed working with her and wish her all the best in her future endeavors."