EXCLUSIVE: Blake Shelton opens up about 'very personal' Gwen Stefani duet, says it might be the best song he's ever written

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Blake Shelton Reveals New Details About 'Very Personal' Duet with Gwen Stefani

Blake Shelton let girlfriend Gwen Stefani tweet a photo of his upcoming album, If I'm Honest, earlier this week, and with the picture came an important reveal: The couple collaborated on a song!

"We finally got a mock-up of the album, what the artwork was going to look like. And we flip it over and it has all the songs. I said, 'You know what? Take a picture of that and tweet it,'" Shelton explained to ET's Sophie Schillaci at The Voice's Karaoke for Charity event in West Hollywood, California on Thursday. "It'll be our way to announce that yes, we have a duet together."

NEWS: Gwen Stefani Reveals the Title of Her Duet With Blake Shelton

Even more exciting, the couple -- who first hooked up last season on The Voice after both going through highly-publicized divorces -- actually collaborated on the songwriting process, a rarity for Shelton.

See photos of Blake Shelton and Gwen Stefani together:

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EXCLUSIVE: Blake Shelton opens up about 'very personal' Gwen Stefani duet, says it might be the best song he's ever written
EAST HAMPTON, NY - AUGUST 20: Blake Shelton and Gwen Stefani attend the Apollo in the Hamptons 2016 party at The Creeks on August 20, 2016 in East Hampton, New York. (Photo by Patrick McMullan/Patrick McMullan via Getty Images)
EAST HAMPTON, NY - AUGUST 20: Blake Shelton and Gwen Stefani perform at Apollo in the Hamptons 2016 at The Creeks on August 20, 2016 in East Hampton, New York. (Photo by Kevin Mazur/Getty Images for The Apollo)
EAST HAMPTON, NY - AUGUST 20: Blake Shelton, Gwen Stefani and Ronald O. Perelman attend Apollo in the Hamptons 2016 at The Creeks on August 20, 2016 in East Hampton, New York. (Photo by Kevin Mazur/Getty Images for The Apollo)
EAST HAMPTON, NY - AUGUST 20: Blake Shelton and Gwen Stefani attend Apollo in the Hamptons 2016 at The Creeks on August 20, 2016 in East Hampton, New York. (Photo by Kevin Mazur/Getty Images for The Apollo)
LAS VEGAS, NEVADA - MAY 22: Blake Shelton and Gwen Stefani are seen on stage during the 2016 Billboard Music Awards held at the T-Mobile Arena on May 22, 2016 in Las Vegas, Nevada. (Photo by JB Lacroix/WireImage)
Blake Shelton and Gwen Stefani embrace after performing "Go Ahead And Break My Heart" at the 2016 Billboard Awards in Las Vegas, Nevada, U.S., May 22, 2016. REUTERS/Mario Anzuoni
LAS VEGAS, NV - MAY 22: Recording artists Gwen Stefani (L) and Blake Shelton perform onstage during the 2016 Billboard Music Awards at T-Mobile Arena on May 22, 2016 in Las Vegas, Nevada. (Photo by Kevin Winter/Getty Images)
BURBANK, CA - MAY 09: Singers Blake Shelton (L) and Gwen Stefani perform on the Honda Stage at the iHeartRadio Theater on May 9, 2016 in Burbank, California. (Photo by Kevin Winter/Getty Images for iHeartMedia)
BURBANK, CA - MAY 09: Singers Blake Shelton (L) and Gwen Stefani perform on the Honda Stage at the iHeartRadio Theater on May 9, 2016 in Burbank, California. (Photo by Kevin Winter/Getty Images for iHeartMedia)
DISNEY CHANNEL PRESENTS THE RADIO DISNEY MUSIC AWARDS - Entertainment's brightest young stars turned out for the 2016 Radio Disney Music Awards (RDMA), music's biggest event for families, at Microsoft Theater in Los Angeles on Saturday, April 30. 'Disney Channel Presents the 2016 Radio Disney Music Awards' airs Sunday, May 1 (7:00 p.m. EDT). (Image Group LA /Disney Channel) BLAKE SHELTON, GWEN STEFANI
BEVERLY HILLS, CA - FEBRUARY 28: Recording artists Gwen Stefani (L) and Blake Shelton arrive at the 2016 Vanity Fair Oscar Party Hosted By Graydon Carter at Wallis Annenberg Center for the Performing Arts on February 28, 2016 in Beverly Hills, California. (Photo by John Shearer/Getty Images)
BEVERLY HILLS, CA - FEBRUARY 28: Recording artists Gwen Stefani (L) and Blake Shelton arrive at the 2016 Vanity Fair Oscar Party Hosted By Graydon Carter at Wallis Annenberg Center for the Performing Arts on February 28, 2016 in Beverly Hills, California. (Photo by John Shearer/Getty Images)
BEVERLY HILLS, CA - FEBRUARY 14: Blake Shelton and Gwen Stefani attend the 2016 Pre-GRAMMY Gala and Salute to Industry Icons honoring Irving Azoff at The Beverly Hilton Hotel on February 14, 2016 in Beverly Hills, California. (Photo by Kevin Mazur/WireImage)
BEVERLY HILLS, CA - FEBRUARY 14: Recording artists Blake Shelton (L) and Gwen Stefani attend the 2016 Pre-GRAMMY Gala and Salute to Industry Icons honoring Irving Azoff at The Beverly Hilton Hotel on February 14, 2016 in Beverly Hills, California. (Photo by Kevin Mazur/WireImage)
GLENDALE, AZ - DECEMBER 27: Gwen Stefani and Blake Shelton wave to fans prior to the NFL game between the Green Bay Packers and Arizona Cardinals at University of Phoenix Stadium on December 27, 2015 in Glendale, Arizona. (Photo by Norm Hall/Getty Images)
GLENDALE, AZ - DECEMBER 27: Musicians Gwen Stefani and Blake Shelton attend the NFL game between the Green Bay Packers and Arizona Cardinals at the University of Phoenix Stadium on December 27, 2015 in Glendale, Arizona. (Photo by Christian Petersen/Getty Images)
Dec 27, 2015; Glendale, AZ, USA; Recording artist Gwen Stefani (left) and country singer boyfriend Blake Shelton on the Arizona Cardinals sideline prior to the game against the Green Bay Packers at University of Phoenix Stadium. Mandatory Credit: Mark J. Rebilas-USA TODAY Sports
GLENDALE, AZ - DECEMBER 27: Musicians Gwen Stefani and Blake Shelton attend the NFL game between the Green Bay Packers and Arizona Cardinals at the University of Phoenix Stadium on December 27, 2015 in Glendale, Arizona. (Photo by Christian Petersen/Getty Images)
Cast member Blake Shelton and singer Gwen Stefani laugh at the party following the premiere for "The Angry Birds Movie" in Los Angeles, U.S., May 7, 2016. REUTERS/Mario Anzuoni
THE TONIGHT SHOW STARRING JIMMY FALLON -- Episode 0126 -- Pictured: (l-r) Singer Gwen Stefani and singer Blake Shelton during a lip synch battle on September 17, 2014 -- (Photo by: Douglas Gorenstein/NBC/NBCU Photo Bank via Getty Images)
THE VOICE -- Season: 7 -- Pictured: (l-r) Adam Levine, Carson Daly, Gwen Stefani, Blake Shelton, Pharrell Williams -- (Photo by: Art Streiber/NBC/NBCU Photo Bank via Getty Images)
THE VOICE -- 'Blind Auditions' Episode 701 -- Pictured: (l-r) Adam Levine, Gwen Stefani, Pharrell Williams, Blake Shelton -- (Photo by: Trae Patton/NBC/NBCU Photo Bank via Getty Images)
THE VOICE -- 'Blind Auditions' Episode 701 -- Pictured: (l-r) Adam Levine, Pharrell Williams, Blake Shelton, Gwen Stefani, Carson Daly -- (Photo by: Trae Patton/NBC/NBCU Photo Bank via Getty Images)
THE VOICE -- 'Blind Auditions' Episode 701 -- Pictured: (l-r) Adam Levine, Gwen Stefani, Blake Shelton, Pharrell Williams -- (Photo by: Trae Patton/NBC/NBCU Photo Bank via Getty Images)
THE VOICE -- 'Live Show' Episode 718B -- Pictured: (l-r) Gwen Stefani, Craig Wayne Boyd, Blake Shelton -- (Photo by: Trae Patton/NBC/NBCU Photo Bank via Getty Images)
THE VOICE -- 'Season 9 Press Junket' -- Pictured: (l-r) Pharrell Williams, Adam Levine, Carson Daly, Gwen Stefani, Blake Shelton -- (Photo by: Trae Patton/NBC/NBCU Photo Bank via Getty Images)
THE TONIGHT SHOW STARRING JIMMY FALLON -- Episode 0353 -- Pictured: (l-r) Singer Adam Levine, singer Gwen Stefani, host Jimmy Fallon, singer Blake Shelton, and singer Pharrell Williams play Spin the Microphone with The Voice Coaches on October 26, 2015 -- (Photo by: Douglas Gorenstein/NBC/NBCU Photo Bank via Getty Images)
THE VOICE -- 'Battle Rounds' -- Pictured: (l-r) Adam Levine, Pharrell Williams, Blake Shelton, Gwen Stefani -- (Photo by: Trae Patton/NBC)
THE VOICE -- 'Live Show' Episode 718B -- Pictured: (l-r) Gwen Stefani, Adam Levine, Pharrell Williams, Blake Shelton -- (Photo by: Trae Patton/NBC/NBCU Photo Bank via Getty Images)
THE VOICE -- 'Blind Auditions' -- Pictured: (l-r) Pharrell Williams, Gwen Stefani, Blake Shelton -- (Photo by: Trae Patton/NBC)
THE TONIGHT SHOW STARRING JIMMY FALLON -- Episode 0353 -- Pictured: (l-r) Singer Adam Levine, singer Gwen Stefani, host Jimmy Fallon, singer Blake Shelton, and singer Pharrell Williams play Spin the Microphone with The Voice Coaches on October 26, 2015 -- (Photo by: Douglas Gorenstein/NBC/NBCU Photo Bank via Getty Images)
NEW YORK, NY - OCTOBER 27: Singers Adam Levine,Blake Shelton, Gwen Stefani, Pharell Williams are seen on the 'Today Show'on October 27, 2015 in New York City. (Photo by Raymond Hall/GC Images)
THE TONIGHT SHOW STARRING JIMMY FALLON -- Episode 0353 -- Pictured: (l-r) Singer Adam Levine, singer Gwen Stefani, host Jimmy Fallon, singer Blake Shelton, and singer Pharrell Williams play Spin the Microphone with The Voice Coaches on October 26, 2015 -- (Photo by: Douglas Gorenstein/NBC/NBCU Photo Bank via Getty Images)
THE VOICE -- 'Live Top 11' Episode 915B -- Pictured: (l-r) Adam Levine, Gwen Stefani, Pharrell Williams, Blake Shelton -- (Photo by: Trae Patton/NBC/NBCU Photo Bank via Getty Images)
THE VOICE -- 'Live Semis' Episode 917B -- Pictured: (l-r) Adam Levine, Gwen Stefani, Pharrell Williams, Blake Shelton -- (Photo by: Trae Patton/NBC/NBCU Photo Bank via Getty Images)
THE VOICE -- 'Live Show' Episode 718B -- Pictured: (l-r) Gwen Stefani, Craig Wayne Boyd, Blake Shelton -- (Photo by: Trae Patton/NBC/NBCU Photo Bank via Getty Images)
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"[The song] is very personal for us both because, you know, we obviously have this bond that is remarkable together," the country star admitted. "But the fact that we wrote a song together... I know that I don't co-write that much because I'm very insecure about it I guess and [Gwen's] kind of got her circle of people that she writes with. But for us to reach out to each other as writers, it may never happen again, who knows."

Shelton wouldn't reveal much of the couple's writing process for the song, a "full-blown duet" titled "Go Ahead and Break My Heart," but it sounds like he's happy with the outcome.

"I hesitate to brag on it too much but I really think that it's as good of a song as I've ever written in my life," the singer shared.

WATCH: 'The Voice': 7 Things You Didn't See on TV Between Gwen Stefani and Blake Shelton During Her Big Return

Stefani shared a picture of her advance copy of If I'm Honest on Thursday, tweeting, "Hi new music @blakeshelton #watermarked #dontleakitgwen."

We can't wait to hear it!

If I'm Honest hits stores May 20. See more about Shelton's upcoming album in the video below.

WATCH: Blake Shelton Reveals New Album Cover on 'The Voice,' Teases It Might Be His Last

Blake Shelton Reveals His Favorite Track Off Gwen Stefani's New Album

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