Lil Yachty stunned fans on Thursday when he revealed in an interview that he was the pen behind City Girls' hit song, "Act Up."

"One day I was in the studio with my best friend Earl and he played the beat and said 'write something for City Girls' and I was like 'okay.' And I just did it," he said.

 "[People] said 'he might have said one thing in the studio and they credit him.' I wrote the whole song, except J.T.'s last verse," Yachty added, "I know them personally, and I know what women like to hear. What's some like, raunchy sh*t? I just started saying it, and before I went in the booth I said 'no homo, y'all" because all my boys was in the room."

"Act Up" was taken from their album, 'Girl Code' and reached no.40 on the Billboard Hot 100.

Did he do a good job or nah?