"Bump n' Grind" is a song written, produced and performed by R&B musician R. Kelly. It was the second single released from his first solo album 12 Play in 1994. The track became a number one single on the U.S. Billboard Hot 100 (temporarily interrupting the six-week run of Ace of Base's "The Sign"), and it also spent twelve weeks at number one on the U.S. Hot R&B Songs chart as the singer's third #1 R&B hit, becoming the longest-running number-one U.S. R&B single at that time. The song also reached number eight in the UK charts, following the massive success of his previous single, "She's Got That Vibe" (which was actually a re-release).