Aguilera, Usher Attend "The Voice" Premiere

The fourth season of U.S. network NBC's singing competition series, "The Voice," premiered on Wednesday (March 20), and previous judge Christina Aguilera joined new judge Usher on the show's premiere red carpet in Los Angeles. Aguilera, who acted as a judge and mentor on the first three seasons, said she was happy to lend her support to the show and to her replacement judge, Shakira.