Brass Knuckles is the fifth studio album by American rapper Nelly, released on September 16, 2008, after several delays.

Jermaine Dupri also stated possibilities of hopeful collaborations with Bruce Springsteen, Mariah Carey and Janet Jackson.

The first single was believed to be "Cut It Out" which features rappers Pimp C and Sean P of YoungBloodZ, but was later confirmed to be "Wadsyaname", which was released digitally on August 21, 2007.

However, because of the pushed release dates from October 16, 2007 and on, the first official single was changed to "Party People", which features Fergie.

"[15] RapReviews wrote that "underneath the materialistic veneer Nelly's got a good delivery, sharp lyrics and impeccable breath control.

"[13] Brass Knuckles debuted at number 3 on the Billboard 200, selling 83,717 copies in its first week in the United States.

On December 12, 2008, the album was certified gold by the Recording Industry Association of America (RIAA) for shipping over 500,000 copies in the United States.