Demi Lovato reveals sister: Singer never knew she had a secret

quot;X Factor" judge Demi Lovato just found out she had an older half-sister.

Demi Lovato reveals secret half-sister: 'I never knew my whole life!

Demi Lovato reveals secret half-sister: 'I never knew my whole life!

Demi Lovato reveals secret half-sister: 'I never knew my whole life!

Demi Lovato reveals secret half-sister: 'I never knew my whole life!

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Lovato finds out about secret half-sister

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