John Mayer and Katy Perry appeared on Good Morning America where they debuted the music video for their duet "Who You Love." Along with talking about their single, John dropped an F-bomb, but caught himself before people seemed to notice.

While talking about being in the studio with Katy, he said: "I come in the studio and she plays stuff and I go. And then I'll hear a melody, cause she'll be writing something, I'll hear a melody and I'll be like, 'Don't! Don't!' She was f--king..."

When he said the word, John realized his mistake and Katy saved him by continuing to talk.