"Rock Star" is the third single from the R. Kelly album Double Up. The song features Ludacris and Kid Rock. It is notable for its use of the guitar, a distinct departure for the usually R&B-oriented Kelly, which was a popular sound in mainstream hip hop during this time. The song peaked at number 54 on the BillboardHot R&B/Hip-Hop Songs chart in its second week on the chart.
The music video, directed by R. Kelly and Elliot Rosenblaut, was filmed at The Carousel in Lemont, Illinois. It begins with R. Kelly, Ludacris and Kid Rock on a tour bus, then entering an almost empty bar to play a gig. They set up their instruments and begin to play and the audience get interested in them and come closer. During Ludacris' verse, he is shown rapping at another area of the bar and in R. Kelly's verse, he is shown singing to many women dancing in a tour bus. The video ends with the bar being full of people cheering and chanting. During the on stage shots, the rest of the band is played by Chicago rock band Kill Hannah. This song is used as Ian Desmond of the Washington Nationals walkup song