B.o.B featured Bruno Mars on the 2010 single “Nothin' on You.” The track is credited to American rapper B.o.B featuring Bruno Mars, with Mars singing the prominent hook and contributing as a songwriter and producer.
The song was written by B.o.B, Mars, Philip Lawrence, and Ari Levine, with production handled by the Smeezingtons. It began during 2009 writing sessions and was initially developed for another artist before Atlantic Records redirected it to B.o.B. Mars was not originally expected to remain on the finished recording, but his vocal performance became central to the song's identity.
Although it is often remembered as an early Bruno Mars hit, “Nothin' on You” is officially B.o.B's song. It served as the lead single from his debut album, B.o.B Presents: The Adventures of Bobby Ray. The single became a major international success and helped launch both performers into wider public recognition.