Kylie Minogue might be hitting 40 next year, but she's certainly proving that age is all in the mind.

The sexy singer strutted her stuff in a lacy black catsuit and fitted corset when she appeared on the X Factor final on Saturday for a duet with 18-year-old Leon Jackson.

After singing her hit Better The Devil You Know, the 39-year-old admitted to the audience that she had been left 'spell-bound' by the young Scot.

"I love your voice, not to mention that you're cute and adorable and everyone loves you - I have fallen under your spell today," she said.

Her sister Dannii, who has been sitting on the judging panel for the duration of the show, added: "You walked into the first audition on your own - now you're like the Pied Piper, you have everybody following you, congratulations."

Sounds like Leon is a hit in the Minogue household!

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