Colby O'Donis Colón is an American singer. He is best known for his guest appearance on Lady Gaga's 2008 single "Just Dance" which peaked atop the Billboard Hot 100, spent over 11 months on the chart, and received diamond certification by the Recording Industry Association of America (RIAA). Due to label conflicts, Senegalese-American singer Akon was unable to perform on the song and recruited O'Donis to do so; O'Donis was Lady Gaga's labelmate on Akon's KonLive Distribution label, to which he signed in 2007.