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 in April 2002. 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 songs "Family Affair" by Mary J. Blige and "Ain't It Funny" by Jennifer Lopez, the two Billboard Hot 100 number-one singles in this volume.