Press meet for 'Voice' series

Singer Christina Aguilera poses during a media event for the upcoming television series 'The Voice' in Los Angeles on March 15, 2011. Singers Aguilera, Blake Shelton, Cee Lo Green and Adam Levine are coaches for participants in the reality television singing competition, which premieres on NBC April 26. (REUTERS/Mario Anzuoni)

Singer Christina Aguilera (L) poses with Executive Producer Mark Burnett during a media event for their upcoming television series 'The Voice' in Los Angeles on March 15, 2011. (REUTERS/Mario Anzuoni)

Singer Christina Aguilera poses during a media event for the upcoming television series 'The Voice' in Los Angeles on March 15, 2011. (REUTERS/Mario Anzuoni)

Singer Christina Aguilera poses during a media event for the upcoming television series 'The Voice' in Los Angeles on March 15, 2011. (REUTERS/Mario Anzuoni)

Singers (L-R) Blake Shelton, Adam Levine, Christina Aguilera and Cee Lo Green pose during a media event for the upcoming television series 'The Voice' in Los Angeles. (REUTERS/Mario Anzuoni)

Host Carson Daly gestures during a media event for the upcoming television series 'The Voice' in Los Angeles on March 15, 2011. (REUTERS/Mario Anzuoni)

Singer Christina Aguilera poses during a media event for the upcoming television series 'The Voice' in Los Angeles on March 15, 2011. (REUTERS/Mario Anzuoni)

Singer Blake Shelton poses during a media event for the upcoming television series 'The Voice' in Los Angeles on March 15, 2011. (REUTERS/Mario Anzuoni)

Singer Adam Levine poses during a media event for the upcoming television series 'The Voice' in Los Angeles on March 15, 2011. (REUTERS/Mario Anzuoni)

Creator and executive John De Mol (L) and executive producer Mark Burnett pose during a media event for the upcoming television series 'The Voice' in Los Angeles on March 15, 2011. (REUTERS/Mario Anzuoni)

Singers Adam Levine (L) and Cee Lo Green attend a media event for the upcoming television series 'The Voice' in Los Angeles March 15, 2011. (REUTERS/Mario Anzuoni)