Simon Cowell picked a bad day to call in sick for "X Factor" auditions -- because Britney Spears, Demi Lovato and fill-in judge Louis Walsh enjoyed cake backstage yesterday in Kansas City with the birthday boy ... L.A. Reid.
As TMZ previously reported, Britney really stepped up her game with Simon out -- despite almost falling on her way into the arena -- and was tough on contestants when need be. Simon is not expected to be healthy enough for today's round of auditions.
'X Factor' Judges
Let Them Eat Cake!
6/9/2012 8:34 AM PDT BY TMZ STAFF
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