VIDEO: Lady Gaga Says She's Tested "Borderline Positive" For Lupus; Shares Michael Jackson Revelation

Some of Lady Gaga's outfits might be full of fluff, but her interviews sure aren't: the pop superstar Tuesday opened up to Larry King, telling the legendary talk show host she's tested "borderline positive" for Lupus, a disease that runs in her family.

Watch the clip here on RadarOnline.com

"Lupus is in my family and it is genetic," the Poker Face singer told King. "My mother told me the other day that my fans were quite worried about me because I did talk about the fact that I was tested for Lupus. And ah, the truth is, I don't show any signs, ah, any symptoms of Lupus. But I have tested borderline positive for the disease. So, as of right now, I do not have it, but I have to take good care of myself."

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The disease -- which causes hyperactivity to the body's immune system and corrodes healthy tissue -- killed an aunt of the singer's in 1976, according to CBS.

In another surprising revelation, Gaga also said she was slated to be Michael Jackson's opening act on his 50-date residency at England's O2 Arena last summer, prior to the Thriller singer's June 25, 2009 death.