Jennifer Hudson sparkles in plunging gown

Singer Jennifer Hudson performs during the opening night of The Smith Center for the Performing Arts in Las Vegas, Nevada. (GETTY/GALLO)

Singer Jennifer Hudson performs during the opening night of The Smith Center for the Performing Arts in Las Vegas, Nevada. (GETTY/GALLO)

Recording artist Jennifer Hudson performs during the opening night of The Smith Center for the Performing Arts in Las Vegas, Nevada. (GETTY/GALLO)

Recording artists Martina McBride and Jennifer Hudson perform during the opening night of The Smith Center for the Performing Arts in Las Vegas, Nevada. (GETTY/GALLO)

Singer Jennifer Hudson performs during the opening night of The Smith Center for the Performing Arts in Las Vegas, Nevada. (GETTY/GALLO)

(L-R) Recording artists Carole King, Martina McBride and Jennifer Hudson perform during the opening night of The Smith Center for the Performing Arts in Las Vegas, Nevada. (AFP)

(L-R) Recording artists Carole King, Martina McBride and Jennifer Hudson perform during the opening night of The Smith Center for the Performing Arts in Las Vegas, Nevada. (GETTY/GALLO)

(L-R) Recording artists Martina McBride, Carole King and Jennifer Hudson perform during the opening night of The Smith Center for the Performing Arts in Las Vegas, Nevada. (GETTY/GALLO)

Recording artist Jennifer Hudson performs during the opening night of The Smith Center for the Performing Arts in Las Vegas, Nevada. (GETTY/GALLO)

Singer Jennifer Hudson performs during the opening night of The Smith Center for the Performing Arts in Las Vegas, Nevada. (GETTY/GALLO)