She said: "I think Cheryl's really cute and has found a way to wear elegant dresses but also look quite funky and casual too."
Kelly also had some kind words for Cheryl's fellow judge on UK TV talent show 'The X Factor' Dannii Minogue - despite being embroiled in a long running public feud with her mother Sharon - praising her "classic" look.
She said: "I actually really like the way Dannii did a more classic look - she looked like a lady not like an older woman who was trying to look younger. I do think she looked great but I prefer Cheryl's style."
She said: "I'm really impressed with Taylor Momsen's music but I think she's trying to be something that she's not. You can't be Cindy Lou Who and wake up the next day and be Courtney Love. It's not a genuine transition - when you turn yourself into something you're not with your fashion, that's when I feel like you should be arrested."