Learn English with Demi Lovato. Singer and mental health advocate Demi Lovato talks about her own personal experiences dealing with bipolar disorder during an appearance Thursday at the National Alliance on Mental Illness Annual National Convention in Washington, D.C. 2014. Demetria Devonne "Demi" Lovato is an American actress, singer-songwriter, author, entrepreneur & philanthropist of Irish, English, Mexican and Portuguese-Jewish descent. 

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