John sat in one of the big, red chairs for Seasons 16 through 22, and Gwen previously had a coaching role on Seasons 7,9, 12, 17, 19 and 22.
NBC will announce the premiere date of the new The Voice season at a later time.
Meanwhile, The Voice's Season 23 live shows kick off Monday night at 8PM ET/PT on NBC.
The May 15 episode will feature two hours of semi-finalist performances.
The Top 8 artists will perform live for the first time in front of the coaches for a chance to make it into the finale. Viewers will vote for their favorite artist in real time, and the results will be revealed at the end of the broadcast.
The Top 8 include "Team Kelly" members D.Smooth, a 25-year-old from Birmingham, AL, and Holly Brand, a 22-year-old from Meridian, MS, as well as "Team Niall" members Gina Miles, a 19-year-old from Paxton, IL, and Ryley Tate Wilson, a 15-year-old from Montgomery, AL.
The upcoming performance show will also feature "Team Blake" members Grace West, a 19-year-old from Canton, MI, and Noivas, a 30-year-old from Hutto, TX, as well as "Team Chance" members Sorelle, a trio of sisters from Lexington, OH, and Ray Uriel, a 25-year-old from Gary, IN.
Season 23 marks Blake's last season as a coach on The Voice. He's been starring on the NBC reality singing competition ever since it debuted its first season in 2011.
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The Voice was created by John de Mol, who serves as an executive producer along with Mark Burnett, Audrey Morrissey, Amanda Zucker, Kyra Thompson and Adam H. Sher.