Demi Lovato Signs As X-Factor Judge

Demi Lovato has officially signed her deal and will be a judge on the next season of "The X Factor" ... TMZ has learned.
According to our sources, Demi will be in...
 NYC tomorrow for the FOX Upfronts to announce her joining the show.
Lovato should have company tomorrow ... as TMZ previously reported, our sources say Britney Spears will be in NYC to announce she's joining the show as well.

News Is Via:TMZ