The 32-year-old singer first appeared in a sparkly catsuit that had us sure she was about to channel her character Ally, but oh, were we wrong. Instead, it was 100 percent Gaga -- and singer Gaga, not actress Gaga -- up on that stage, back to her old tricks of belting out lyrics amid leg kicks, crazy faces and whipping her hair back and forth.
ET's Kevin Frazier spoke with Gaga backstage after her surprising performance, and the singer said she "had a great time" playing for the GRAMMYs audience.
"I love playing music and I just love everybody in that room and I was just so happy to sing for the world, you know?" Gaga marveled. "It’s a blessing everyday."
"It’s a really special song," Gaga shared. "I know that might sound like not a good thing to say coming from the person that co-wrote it, but we had a special moment in that room together, me and [co-writers] Mark Ronson and Anthony Rossomando and Andrew Wyatt. It was two guitars, a bass, a piano, a typewriter and us talking and singing back and forth and having a conversation."
Gaga said the the song is ultimately a "conversation between a man and a woman and I think that represents a lot."
"All [of us] in this world, we need to keep talkin' and we need to keep talkin' about the things that are important," she added. "Not [about] the shallow s**t, but the deep [things]."
Gaga was already a winner before her performance, taking home three awards for Song Written for Visual Media and Best Pop/Duo Performance for "Shallow," and Best Pop Solo Performance with "Joanne (Where Do You Think You’re Goin’?)." She also won a BAFTA on Sunday, making her the first person to win a BAFTA and a GRAMMY in the same day.
The singer gushed over the award on Twitter. “I can’t believe we just won Best Original Music @BAFTA‘s. I wish so much I was there but am at the Grammy’s to show them our love as well. We made a film about music. This means the world to me. Thank u to all our fans we love u so much, we wouldn’t be here without u #BAFTAs," she wrote.