VIDEO: First Look - Christina Aguilera Returns for 8th Season of THE VOICE

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NBC's THE VOICE returns for its 8th season on February 23rd. Below, check out an all-new trailer which showcases this season's coaches, Adam Levine, Blake Shelton, Pharrell Williams and Christina Aguilera, who returns to "The Voice" for the first time since the show's fifth season.

"The Voice" returns with the strongest vocalists from across the country invited to compete in the blockbuster vocal competition show's eighth season. Internationally acclaimed artist Christina Aguilera returns to join megastars Pharrell Williams, Adam Levine and Blake Shelton as celebrity musician coaches, while Carson Daly continues to serve as host.

The show's innovative format features five stages of competition: the first begins with the Blind Auditions, then the Battle Rounds, the Knockouts, the Live Playoff's and finally, the Live Performance Shows.

During the Blind Auditions, the decisions from the musician coaches are based solely on voice and not on looks. The coaches hear the artists perform, but they don't get to see them -- thanks to rotating chairs. If a coach is impressed by the artist's voice, he/she pushes a button to select the artist for his/her team. At this point, the coach's chair will swivel so that he/she can face the artist he/she has selected. If more than one coach pushes his/her button, the power then shifts to the artists to choose which coach they want to work with. If no coach pushes his/her button, the artist is eliminated from the competition.

Once the teams are set, the battle is on. Coaches will dedicate themselves to developing their team of artists, giving them advice, and sharing the secrets of their success, along with help from their celebrity advisers. During the Battle Rounds, the coaches will pit two of their own team members against each other to sing the same song together in front of a studio audience. After the vocal battle, the coach must choose which of his/her singers will advance to the next round of competition, while the losing artist is available to be stolen by another coach. Each coach has two steals available during the Battle Rounds.

At the end of the battles, only the strongest members of each coach's roster remain and proceed to the Knockout Rounds. Here, the artists will be paired against a teammate once more, but this time they will select their own songs to perform individually, while their direct competitor watches and waits. They are vying for their coach's confidence and decision to take them to the Live Shows. One superstar, universal advisor will be on hand to work with all of the coaches and their teams as they prepare the artists for this challenge. But the coaches alone will choose the winner and the artist not selected will be available to be stolen by another coach. Each coach has one steal available during the Knockout Rounds.

In the Live Playoff Rounds, the top 20 artists will compete to secure a spot in the Live Shows. Artists will perform live and America will vote to save their two favorite artists from each team. The coaches will then save one remaining artist to complete their roster. The remaining contestants will move on to the final phase of the competition, the Live Shows.

Photo courtesy of NBC

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