Kanye West disses Ray J, the rapper his girlfriend Kim Kardashian made a sex tape with, on a surprise appearance on Late Night with Jimmy Fallon on Monday.

The Yeezus rapper performed another single off the album, “Bound 2,” with the Roots, which marked his first-ever performance on Fallon’s late night show.

MTV News reports during a part where he rapped over a children’s chorus, West said, "Brandy's little sister lame, man, he know it now. When a real brother hold you down you supposed to drown."

West just announced a solo tour, his first in five years. He will be joined by Kendrick Lamar, however, as a guest. He will kick it off on Oct. 19 in Seattle. He will wrap it up on December 7 in Houston, TX.

West has rapped about Kardashian’s sex tape before, saying “Eat breakfast at Gucci. My girl a superstar all from a home movie” in his song “Clique” with Jay-Z.

Fallon took to Twitter after the performance and wrote: