Demi Lovato revealed a family secret on the radio.

"I have an older sister I've never known my whole life, who's in her 30s," Lovato, 20, told Long Island, N.Y., radio station, when asked if there's anything personal she'd like to share with her fans. "She's my half-sister, but I talked to her for the very first time in my life around when I turned 20."

Calling from a "fancy" VIP airport lounge before a flight, Lovato – who didn't go into detail about which parent this sister came from – went on to say, "I asked her, I said, 'Why haven't you ever contacted me?' She said, 'Well, I never wanted you to think I wanted anything from you. So I've just been kind of waiting to see if you wanted a relationship.' I thought that was so incredible. So, I actually have three sisters."

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