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

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

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Demi Lovato discovers half-sister

Demi Lovato reveals secret half-sister

Demi Lovato couldn't see her sister until she got sober

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Demi Lovato discovers secret half-sister

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