Nick Jonas is joining "The Voice" as a coach for Season 18.

The youngest of the Jonas Brothers announced he is joining fellow singers Blake Shelton, John Legend and Kelly Clarkson — but not Gwen Stefani, who will not be returning to the competition series next season.

The news of Jonas' new gig was announced on "The Ellen DeGeneres Show" on Monday.

GWEN STEFANI DIDN'T KNOW WHO BOYFRIEND BLAKE SHELTON WAS BEFORE 'THE VOICE'

Shelton, 43, welcomed the 27-year-old singer to the series in a video clip shared on DeGeneres' show.

This Sept. 19, 2019 file photo shows Nick Jonas, from left, Kevin Jonas, and Joe Jonas, of the Jonas Brothers, performing during their "Happiness Begins Tour" in Chicago.

This Sept. 19, 2019 file photo shows Nick Jonas, from left, Kevin Jonas, and Joe Jonas, of the Jonas Brothers, performing during their "Happiness Begins Tour" in Chicago. (AP)

"Nick Jonas! How you doing, buddy?" said Shelton. "I heard that you’re going to be a new coach on 'The Voice' and I wanted to, first of all, say congratulations, I guess. But second of all, I wanted to voice some concerns that I have. I’m going to have to look through the rules because this is my TV show. I’m not even sure if you’re old enough to be a coach on 'The Voice,' but I’m certain that you’re going to get your butt kicked buddy."

ELLEN DEGENERES STANDS UP TO TWITTER MOB, DEFENDS APPEARING WITH 'FRIEND' GEORGE W. BUSH

Meanwhile, Clarkson, 37, said she and Jonas should team up.

"I do definitely feel like the two Texans should maybe team up and form an alliance. I’m just saying," she said.

Legend, 40, said he wants Jonas' help to beat Shelton.

KELLY CLARKSON 'GOT REAL BITTER' AFTER 'AMERICAN IDOL,' SAYS 'THE VOICE' HEALED HER

"Our mission is to destroy Blake Shelton. We have to form an alliance — me, you, Kelly. We team up, we beat Blake, nothing else matters. Deal? See you soon."

Jonas told DeGeneres he's "so excited" to join "The Voice" and then shared a message for Shelton.

CLICK HERE TO GET THE FOX NEWS APP

"Just to be clear, Blake, I’m going to kick your a--. I think Kelly’s point about forming an alliance might make sense, and John, I love you, but we need a side conversation to figure some things out."

Season 18 of "The Voice" debuts in Spring 2020.