VIDEO: Watch Shakira Judge her First Audition on NBC's THE VOICE

Related: THE VOICE, NBC, previews & teasers, Reality TV

Below, check out promo clips for NBC's upcoming season of THE VOICE, featuring new judges Shakira and Usher. Also, watch Shakira as she judges her very first audition on the show! The news season premires on March 25 (8-10 p.m. ET) on NBC.

"The Voice" returns with the strongest vocalists from across the country invited to compete in the blockbuster vocal competition show's fourth season. Celebrity musician coaches Adam Levine and Blake Shelton return along with new coaches, Usher and Shakira, while Carson Daly continues to serve as host and Christina Milian as social media correspondent.

The show's innovative format features four stages of competition: the first begins with the blind auditions, then the battle rounds, the knockouts 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. The artists will be paired again with a member of their own teams, but this time they find out only minutes before performing with whom they are competing. The artists each 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. Their coach will choose the winner and the artist not selected will be sent home.

In the final live performance phase of the competition, the top artists from each team will compete each week against each other during a live broadcast. The television audience will vote to save their favorite artists and the two artists with the lowest number of votes will be sent home each week. In the end, one will be named "The Voice" and will receive the grand prize of a recording contract.

"The Voice" is a presentation of Mark Burnett's One Three Inc., Talpa Media USA Inc. and Warner Horizon Television. The series is created by John de Mol, who executive-produces along with Burnett, Audrey Morrissey, Stijn Bakkers and Lee Metzger.