Release History
| Region | Date | Format |
|---|---|---|
| United States | April 7, 2009 | Rhythmic and urban airplay |
| April 14, 2009 | Mainstream airplay | |
| United Kingdom | May 4, 2009 | Digital download |
| June 22, 2009 | CD single | |
| Brazil | September 9, 2009 | Digital download |
Read more about this topic: Knock You Down
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