"You Know I'm No Good" is a song written and performed by English singer Amy Winehouse from her second and final studio album, "Back to Black" (2006). "You Know I'm No Good" was released as the second single from "Back to Black" on 5 January 2007. Originally recorded as a solo track, it was remixed with guest vocals from the Wu-Tang Clan member Ghostface Killah. The original appeared on Winehouse's album, while the version with Ghostface Killah appears on his album "More Fish".