The Voice determined the last seven of its 32 "knockout" round semifinalist acts during Tuesday night's broadcast of the NBC reality singing competition's fourth season.

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The Voice's musician coaches Shakira, Usher, Adam Levine, and Blake Shelton each completed their fourth-season teams with the conclusion of the season's "battle" rounds -- which ultimately reduced the competition's 48 artists to four eight-person teams.

Amy Whitcomb from Orlando, FL; Sarah Simmons from Memphis, TN; Justin Rivers from Bowling Green, KY; Shawna P. from Orange Beach, AL; Mary Miranda from Albuquerque, NM; and Michelle Chamuel from Amherst, MA, advanced to The Voice's "knockout" round.

Amy, Sarah, Justin, Shawna, Mary, and Michelle moved forward in the competition after they won their respective "battle" round face-offs against fellow contestants Agina Alvarez, Duncan Kamakana, Rhian Morgan and Cara Morgan -- a sister duo from Rochester, NY who perform as The Morgan Twins -- Brandon Roush, Cathia, and Chelsea M.

The acts squared off in the "battle" rounds after The Voice coaches each selected two members of his or her individual singing team to perform a duet performance that would end with the coach eliminating one of the singers from the competition.

However, similar to last season, each coach is allowed two "steals" all season in which two losing face-off contestants may be added to a different coach's original six-member team of "battle" round-winners.

During Tuesday night's broadcast, one contestant was stolen and that person was Cathia from Bronx, NY.

Amy and Agina were matched up by Adam and required to sing "Heartbreaker" by Pat Benatar.

Adam also paired Sarah and Duncan together to sing "Wanted You More" by Lady Antebellum.

Justin and The Morgan Twins were selected by Blake and assigned "Easy" by Rascal Flatts for their "battle" round.

Shakira matched up Shawna and Brandon, who were required to perform "Piece Of My Heart" by Janis Joplin.

Shakira also paired Mary and Cathia and then had them sing "Antes De Las Seis" by Shakira. Cathia was stolen by Usher.

Michelle and Chelsea were selected by Usher and ended up performing "Titanium" by David Guetta featuring Sia.
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The seven artists join the 25 semifinalists who had advanced during the last couple weeks of "battle round" episodes.

Now that the "battles" have ended, next week will feature the beginning of the fourth season's "knockout" rounds. For every team, each artist will perform individually against one of his or her own teammates one at a time.

The contestants, who will be able to select their own songs to perform, will be surprised at the last minute by whom their coach chooses to put them up against. The acts to survive the "knockout" round will advance to the live performance shows.
About The Author: Elizabeth Kwiatkowski
Elizabeth Kwiatkowski is Associate Editor of Reality TV World and has been covering the reality TV genre for more than a decade.