Kelly Rowland and Stevie Wonder hit the stage last night at the Keep Memory Alive Foundation’s Power of Love Gala. The event, celebrating the 70th birthday of boxing legend Muhammad Ali, also saw John Legend and others take the stage.  Kelly, along with Stevie Wonder,  honored Ali with a tribute to her idol Whitney Houston by performing “The Greatest Love of All” 20 years after Houston sang the song for Ali at his 50th birthday party.   Check out their performance above, and Whitney 1992 performance for Ali below.