The "Applause" singer sat down for an interview with DeGeneres, airing Monday (Nov. 25), and revealed how and why she and Kinney fell in love.
"He's a hidden weirdo. He is extremely strange, actually, and we complement each other's weirdness," she told DeGeneres of the "Chicago Fire" star. "That's actually one of the first things he ever said to me. It's a Dr. Seuss quote, that you find in someone else a 'compatible weirdness.' And it was one of the first things he said to me."
Gaga, 27, and Kinney, 32, who've been dating since July 2011, first met on the set of the her "You and I" music video, in which she dons some pretty outlandish looks.
"I looked ridiculously crazy ... I mean why he found me attractive just completely moves me," she laughed, adding, "We were in the middle of this scene and I remember he kissed me and he wasn't scripted to kiss me and I was sort of like, 'Uh, was that real or was that fake?' And he just really didn't say anything. And that was fine by me."
"At the end of the day, he's my best friend," Gaga gushed, "and having your lover be your best friend -- I mean, it's the best thing ever."
Everybody now ... Awww.