Demi, the youngest judge

Teen singer Demi Lovato, 19, the former star of Disney Channel’s Sonny With a Chance, will be co-judging the show with Spears. She will be the youngest judge on a US TV talent show, and that is key because broadcast TV networks try to lure younger audiences whom advertisers covet for their spending power.

Teen singer Demi Lovato, 19, the former star of Disney Channel’s Sonny With a Chance, will be co-judging the show with Spears. She will be the youngest judge on a US TV talent show, and that is key because broadcast TV networks try to lure younger audiences whom advertisers covet for their spending power.

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Lovato is also seen as a draw for Latino viewers because of her Mexican, Irish and Italian descent. But TVLine.com writer Michael Slezak said Lovato’s resume was “as light as beaten egg whites” and questioned if the teen was ready for the spotlight of a high-profile TV show after her 2010 stint in rehab for eating disorders.