Lady Gaga on her buzzed-about Oscars performance

The Best Original Song winner talks backstage with "GMA" about her intimate performance with her "A Star is Born" co-star Bradley Cooper.
4:09 | 02/25/19

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Transcript for Lady Gaga on her buzzed-about Oscars performance
Back now with one of the big moments last night. Lady gaga with Bradley cooper. Lady gaga winning an Oscar for that song. She gave a lot of credit to Bradley cooper. Yes, she did. I know what all of you are thinking. It's what everyone was thinking watching them look and each other's eyes. No confirmation from them about anything other than a deep, loving friendship. That created one of the most special Oscar moment any of us has ever seen. And the Oscar goes to -- lady Reporter: Wit tuz moment she went from nominee to winner. If you are at home, and you're sitting on your couch, and you're watching this right now, all I have to say is that this is hard work. Reporter: Gaga taking home the Oscar for best original song for her work on "A star is born's" signature piece, "Shallow." ??? Tell me something girl are you happy in this modern world ??? Reporter: The wip coming just after her electrifying performance with co-star Bradley cooper. ??? I'm off the deep end ??? Reporter: The independent mat performance with the audience acting as a backdrop, bringing the entire Dolby theater to it feet. The chemistry between the co-stars undeniable. The duo earning two standing owe once when the song was over. And again when they reentered the auditorium. I've done a lot of live TV performances. I rarely relinquish control. I was like, Bradley this one son you. He had a beautiful vision for what he wanted. So all of the camera movement and everything you saw, that was from him. That was the director. The truth is, this song wouldn't have won tonight. And this song wouldn't be what it is without him. Bradley, there is not a single person on the planet that could have sang this song with me but you. Thank you for believes in us. Was there ever a moment when someone other than Bradley would have sung it? It was meant to be -- we felt it would be a great duet. He thought so as well. I have sung with a lot of I really meant what I said no one could have sang that song but him. I've worked hard for a long time. It's not about, you know, it's not about winning. But -- what it's about is not giving up. The you have a dream, fight for it. I loved if your speech, you may not remember how eloquent you were. You said it's not about winning. It's about not giving up. I loved that. Yeah, I don't -- I don't remember what I said. Most don't. You were great. I hope so. I hope so. Is T it a dream sequence right now? It is. All that you can hope for is that you say something that will reach people. That they'll feel inspired. Because, when you win, it's not about us. You know, it's about what we can give to the world. Reporter: But gaga's new golden statue was not her only accessory turning heads. I can't decide what I'm more mesmerized by, the diamond or the Oscar. I'm pretty happy about the Oscar. Yes. Yeah, great. We love the Oscar. Let's talk about the diamond. It's the Tiffany diamond. Over 128 karats. The first time it's been on the red carpet since Tiffany bought it in 1878. The last time it was scene in public was in 1961 for "Breakfast at Tiffany's" shots. He said he was thankful to make this exception for gaga, an innovator and one of a kind, just like the diamond. Looks like fun. Much more on the oscars coming

This transcript has been automatically generated and may not be 100% accurate.

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