Chaka Khan - I'm Every Woman
Whitney Houston - I'm Every Woman
Whitney Houston, Chaka Kahn - I'm every woman (1999)
Now for some honorable performances by other vocal powerhouses.
Jennifer Hudson
Kelly Clarkson
Then there is this version by Jessie J. I cannot seem to find the "video" version that used to be on YouTube but here is an audio of it. Her original song is first and then this song is at 2:10.