Christina Aguilera, competition The Voice, John de Mol,

Christina Aguilera signed to be a part of the John de Mol created singing competition The Voice which has been airing on NBC since late April.

Christina Aguilera, alongside other musicians Adam Levine, Blake Shelton and Cee Lo Green serve as judges and coaches, with Carson Daly as the show's host.

The Voice show's first episode was released to positive reviews and made its debut at number one on the American rating list chart, delivering the strongest ratings for a series premiere on a major network since Undercover Boss debuted after the Super Bowl in February 2010.

The second episode attracted 12.58 million viewers and a 5.7 rating, the highest for NBC since November, 2005.