Simon Cowell joked Demi Lovato was ''obnoxious'' and ''irritating'' in a pre-recorded video speech at the Teen Choice Awards last night.
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Simon Cowell: 'Demi Lovato is irritating'
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Simon Cowell calls fergie a ``trouper''
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Jessica Alba thinks she's ugly
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Howard Stern criticises Simon Cowell for hiring Britney Spears
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Nicki Minaj dreams of Simon Cowell
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Simon Cowell apologises to Katherine Jenkins
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Craig Ferguson to Simon Cowell: 'you lying sack of crap'
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Demi Lovato: ``I am not dating Joe Jonas''
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Watch Selena Gomez + Simon Cowell read mean tweets about themselves
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Simon Cowell to leave American Idol
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X Factor Simon Cowell backs Olly
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Demi Lovato performs ``Make a Wave'' on Extreme Makeover Home Edition
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Simon Cowell making drastic changes to the X Factor
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Simon Cowell warned Cheryl
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Simon Cowell may quit 'Britain's Got Talent'
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Demi Lovato enjoys wild night out with friends
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Sir Andrew Lloyd Webber slams Simon Cowell for ``not working hard''