Now That's What I Call Music! 9 was released on March 19, 2002. The album is the ninth edition of the (U.S.) Now! series. It debuted at number one on the Billboard 200 albums chart.It is the fourth number-one album in the series and has been certified 2× Platinum by the RIAA.

The album was the first in the series to include radio remixes of some tracks, rather than the originals.It also features the song, "Family Affair", the lone Billboard Hot 100 number-one single in this volume.