Kylie? I'd go for Dannii any day, says Simon Cowell

TV's Mr Nasty is a big fan of the 35-year-old Australian singer - and the feelings are mutual.

"There's something about her (Dannii) that's very mysterious - I think she keeps some aspects of her character private," Cowell told The Sun.

"She's an incredibly sexy girl, but she doesn't realise how sexy she is.

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A new judge in town: Dannii Minogue's appearance on X Factor has had a huge impact on Simon Cowell and Sharon Osbourne (above with Louis Walsh)

"I tell you something, given the choice between Kylie and Dannii, I would go for Dannii any day," Cowell told The Sun.

Returning the compliment, Minogue, who is single, told YOU magazine: "Simon's very fanciable!

"It's his confidence. I like that in someone."

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Dannii is best known in the UK as Kylie's younger sister, however Cowell believes her appearance on X Factor will see her emerge as a star in her own right.

"I think she has been a little bit in Kylie's shadow, but she is, in her own right, very intelligent and very savvy.

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Dannii Minogue is 'incredibly sexy,' says Cowell

"She told me she watched the X Factor with Kylie.

"When we did the first day of recording she was in a bit of a shock as she kept telling me, 'I feel a bit strange to be here, in between you and Sharon (Osbourne)."

However it's not Cowell's long-term girlfriend Terri Seymour who is slightly jealous of Dannii's impact on him but fellow judge Sharon Osbourne.

Cowell explained: "When I sit next to one, the other sulks.

"I have to try to give each one equal attention.

"You know girls can be very catty and it's been very interesting watching how another woman has affected the dynamic of the group."