The X Factor UK judge is currently number one with debut solo single 'Young' and was last week named FHM's 'Sexiest Woman in the World' for 2012.
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However, former Atomic Kitten singer Katona told Now magazine: "I don't know how to put it without being rude, but she doesn't have that star quality."
The reality TV star added: "There's something about her I just don't get!"
The Only Way Is Essex's Mario Falcone took to Twitter last week to question Contostavlos's poll victory, suggesting the N-Dubz singer's victory was a "fix".
Watch celebrities praise Tulisa's FHM win in our exclusive below:
