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LAS VEGAS, NV ? SEPTEMBER 15: Singer Whitney Houston is seen performing on stage during the 2004 World Music Awards at the Thomas and Mack Center on September 15, 2004 in Las Vegas, Nevada. (Photo by Kevin Winter/Getty Images)

LAS VEGAS, NV ? SEPTEMBER 15:  Singer Whitney Houston is seen performing on stage during the 2004 World Music Awards at the Thomas and Mack Center on September 15, 2004 in Las Vegas, Nevada.  (Photo by Kevin Winter/Getty Images)