Demi Lovato - Check out Demi, Britney Spears, LA Reid and Louis Walsh (filling in for Simon Cowell) at the Kansas City auditions for The X Factor (USA)!

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Demi Lovato - Check out Demi, Britney Spears, LA Reid and Louis Walsh (filling in for Simon Cowell) at the Kansas City auditions for The X Factor (USA)!

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Demi Lovato - Check out Demi, Britney Spears, LA Reid and Louis Walsh (filling in for Simon Cowell) at the Kansas City auditions for The X Factor (USA)!

Spears 'hasn't seen an X Factor winner

Demi Lovato - Check out Demi, Britney Spears, LA Reid and Louis Walsh (filling in for Simon Cowell) at the Kansas City auditions for The X Factor (USA)!

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Demi Lovato - Check out Demi, Britney Spears, LA Reid and Louis Walsh (filling in for Simon Cowell) at the Kansas City auditions for The X Factor (USA)!

Louis Walsh: Britney Spears was on medication on 'X Factor

Demi Lovato - Check out Demi, Britney Spears, LA Reid and Louis Walsh (filling in for Simon Cowell) at the Kansas City auditions for The X Factor (USA)!

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Demi Lovato - Check out Demi, Britney Spears, LA Reid and Louis Walsh (filling in for Simon Cowell) at the Kansas City auditions for The X Factor (USA)!

Shows A-Z - x factor, the on fox

Demi Lovato - Check out Demi, Britney Spears, LA Reid and Louis Walsh (filling in for Simon Cowell) at the Kansas City auditions for The X Factor (USA)!

Louis Walsh: Britney Spears 'was on so much medication' on 'X Factor

Demi Lovato - Check out Demi, Britney Spears, LA Reid and Louis Walsh (filling in for Simon Cowell) at the Kansas City auditions for The X Factor (USA)!

Video! Britney Spears Backstage on 'X-Factor