This is Gaga when the winner was announced:
And here she is talking to them backstage. Her speech to them starts at the 30-second mark:
Lady Gaga: I don't know what I heard out there, but if I did hear what I heard out there, I just want to tell you that you deserve every bit of success that you have. And don't you dare let those people boo you. And I put that booing in my own show because I wanted to make a comment about that, and it's so fu — I want to leave right now, I don't want to stay anymore. Because I don't want to be in a room where people will boo like that.
Louis Tomlinson: Ah well, fuck it, fuck it.
Lady Gaga: You deserve it. You deserve a lot. You deserve a lot.
And then they took a picture and Louis said he felt underdressed because if you notice, GAGA IS PRACTICALLY NAKED. And Zayn's face was priceless.
It was the best unseen moment of the VMAs except for this one.