The 52-year-old also said that Kardashian should be given a star on the Hollywood Walk of Fame, reported Daily Star.
"She's very cute and has a naughty side. I adore her. They shouldn't have denied her a star on the Walk of Fame," he said.
Cowell also has high praise for Kardashian's boyfriend Kanye West, calling the hip hop musician an innovator.
"I think he's super-talented and an innovator. He knows what he's doing. Plus he's controversial and I like that," he said.