Speaking on her FUBAR Radio show this morning (1 July), Katie said that Cheryl isn't wowing her as much this time around, having quit the hit reality series three years ago.
Katie said: "I like Cheryl but I don't think she's got the same spark this time than last time.
"She hasn't got that twinkle in her eye anymore. She is stunning, I'm not saying she doesn't look amazing and gorgeous, but her eyes have lost that spark for me."
Katie added: "I think she'll be brilliant though and maybe when she's back out there I'll change my mind."
Cheryl announced her return to The X Factor earlier this year and is set to release her comeback single 'Crazy Stupid Love' later this month.
Meanwhile, one person who would disagree with Katie is Simon Cowell's righthand woman Sinitta, who believes Cheryl is "stronger than ever".
"She's a stronger, more empowered woman now," Sinitta told Reveal.
"Simon used to guide her, put a protective arm around her, he ushered her through and gave her the confidence to do it.
"Now, she doesn't need that as she's overflowing with confidence now."
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