Demi Lovato's secret half-sister

Demi Lovato's secret half-sister, Demi Lovato's never been one to shy away from interviews, and now the singer has opened up about what it was like to just recently discover the existence of a secret half-sister. The 20-year-old "Heart Attack" singer revealed the news to WBLI radio station Monday morning, saying that she spoke to her sister for the first time over the summer.

"I just got to know … I have an older sister that I've never known my whole life. She's in her 30s. She's my half-sister. I talked to her for the very first time in my life around when I turned 20 [in August 2012]," Lovato said on the “Dana & Jeffrey in the Morning” show.

The "X Factor" judge added: "I asked her, 'Why haven't you ever contacted me?' She just said, 'Well, because I never wanted you to think that I wanted anything from you. So I've just kind of been waiting to see if you wanted a relationship. I thought that was so incredible. So I actually have three sisters!"