Demi Lovato: 'Simon Cowell Is Annoying And Old'

Ahead of the big X Factor USA final, Demi needles her boss

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Demi Lovato has opened up about her relationship with her fellow X Factor USA judges saying that although she gets on with Britney and soon to be ex-judge L.A Reid, she thinks Simon Cowell is "annoying", and in what will come as a body blow to the famously vain svengali, "old".

Ahead of next week's final the star, who's mentoring the young adults category, stuck the needle into Cowell, possibly hoping for a reaction from her boss.

The singer and actress was a new judge this year and she's apparently bonded with Britney, despite what was a reportedly a difficult start to their time on the panel.

If selected, next time around Brit and Demi will have to do without L.A Reid, who's left the show after two seasons.

 Demi told People: "Britney Spears is sweet and humble; L. A. Reid is hilarious and smart; and Simon Cowell is annoying and old!"

However she did back track a little bit, blaming her big mouth for her comments, saying: "Not at all. It’s an honor to sit next to them because they’re legends, but I’m a southern girl with a big mouth, and I speak my mind!"

PHOTOS: The X Factor USA Contestants mingle with fans

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The X Factor USA contestants visit L.A shopping mall, November 26 (Photos: Splash News)