Kelly Rowland was on hand to celebrate Muhammad Ali's 70th birthday this weekend in Las Vegas. She and Stevie Wonder performed 'The Greatest Love Of All' in honor of Ali -- and, of course, Whitney Houston.
While Houston made the song truly famous, it was originally performed by George Benson for the 1977 film based on Ali, 'The Greatest.' The timing of Rowland's performance was both moving and deliberate. She nails the track -- it's almost astounding how much she sounds like the late legend herself.

Wonder played piano during Rowland's showstopping performance. It was the second tribute to Houston Wonder made that day (Feb. 18). Earlier, Wonder joined Alicia Keys and R. Kelly and performed at the late singer's funeral. Aretha Franklin also paid tribute to Houston at her concert on Saturday night.

Following her star-studded funeral, Houston was buried in a private, family-only ceremony on Sunday, Feb. 19, in Westfield, N.J. We think she'd be honored at Rowland's rendition of her breakout hit.

Watch Kelly Rowland Perform 'The Greatest Love Of All'