who sings with lady gaga in just dance
Colby O'Donis.
Just Dance (song)
"Just Dance" is the debut single by American singer Lady Gaga. She co-wrote the song with Akon and its producer RedOne. It also features vocals from Colby O'Donis and was released on April 8, 2008 as the lead single from Gaga's debut studio album, "The Fame". The song was written by Gaga in 10 minutes as 
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Just Dance (song) [SEP] Introduction
"Just Dance" is the debut single by American singer Lady Gaga. She co-wrote the song with Akon and its producer RedOne. It also features vocals from Colby O'Donis and was released on April 8, 2008 as the lead single from Gaga's debut studio album, "The Fame". The song was written by Gaga in 10 minutes as "a happy record". "Just Dance" lyrically speaks about being intoxicated at a club. The song received positive reviews from music critics, who complimented its club, anthem-like nature and the sound associated with it. The song reached number one in the United States, Australia, Canada, Ireland, the Netherlands and the United Kingdom, as well as the top five in the Czech Republic, Hungary, New Zealand, Norway, Scotland, Spain, and Sweden.