Ailing soul singer Luther Vandross, who suffered a stroke in April, won two American Music Awards last night. The 52-year-old crooner was named favorite male R&B performer and his latest CD, Dance with My Father, was honored as favorite soul-R&B album. His mother, Mary Vandross, accepted both awards on his behalf. Other winners included 50 Cent (male rap artist and rap album), Missy Elliott (female rap artist), Justin Timberlake (pop album) and Faith Hill (female country performer). For a recap of the evening's highs and lows, read Danny Spiegel's Watercooler column.