Blake Shelton calls meeting Gwen Stefani 'a miracle' after 'hitting rock bottom'

Blake Shelton is opening up about his relationship with Gwen Stefani.

The country star appears on Sunday's upcoming episode of Sunday TODAY With Willie Geist and gives insight into the start of his relationship with the pop princess. 

"When I was going through my divorce and just hit rock bottom, just like anyone does when they go through something that devastating, it's a miracle that I met somebody that was going through the same exact thing that I was at the exact same moment in time," Shelton, 42, says. 

Both Shelton and Stefani, 48, divorced their partners — Miranda Lambert and Gavin Rossdale respectively — in 2015, before confirming their relationship in November of that year. For that reason, many people, Shelton and Stefani included, assumed they would have a quick rebound relationship.

"I think if Gwen and I were being honest right now talking about this, I think in the back of our minds we both kind of thought this is a rebound deal," Shelton reveals. "I mean, because we're both coming out of a pretty low spot in our lives and we're kind of clinging to each other to get through this."

45 PHOTOS
Blake Shelton and Gwen Stefani together
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Blake Shelton and Gwen Stefani together
❤️🙏🏻 #vegas #justagirl @blakeshelton gx #picsbysophiemuller
LAS VEGAS, NV - JUNE 28: Singer Gwen Stefani (L) and recording artist Blake Shelton attend the grand opening of the 'Gwen Stefani - Just a Girl' residency at Planet Hollywood Resort & Casino on June 28, 2018 in Las Vegas, Nevada. (Photo by Gabe Ginsberg/FilmMagic)
LAS VEGAS, NV - APRIL 15: Blake Shelton (L) and Gwen Stefani attend the 53rd Academy of Country Music Awards at MGM Grand Garden Arena on April 15, 2018 in Las Vegas, Nevada. (Photo by Jeff Kravitz/ACMA2018/FilmMagic for ACM)
LAS VEGAS, NV - APRIL 15: Blake Shelton (L) and Gwen Stefani attend the 53rd Academy of Country Music Awards at MGM Grand Garden Arena on April 15, 2018 in Las Vegas, Nevada. (Photo by Jeff Kravitz/ACMA2018/FilmMagic for ACM)
LAS VEGAS, NV - APRIL 15: Blake Shelton and Gwen Stefani attend the 53rd Academy of Country Music Awards at MGM Grand Garden Arena on April 15, 2018 in Las Vegas, Nevada. (Photo by John Shearer/ACMA2018/Getty Images for ACM)
LAS VEGAS, NV - APRIL 15: Blake Shelton and Gwen Stefani attend the 53rd Academy of Country Music Awards at MGM Grand Garden Arena on April 15, 2018 in Las Vegas, Nevada. (Photo by Jason Merritt/ACMA2018/Getty Images for ACM)
LAS VEGAS, NV - APRIL 15: Blake Shelton and Gwen Stefani attend the 53rd Academy of Country Music Awards at MGM Grand Garden Arena on April 15, 2018 in Las Vegas, Nevada. (Photo by John Shearer/ACMA2018/Getty Images for ACM)
@blakeshelton have a good show tonight we r missing u in L.A.❤️ gx
#youmakeitfeellikechristmas @nbcthevoice @blakeshelton #backstage gx
#❤️ #countrymusicfreakstour2018 @blakeshelton #stlouismissouri gx
Yay!! It was incredible to write with @BlakeShelton & share the stage for a song that is so joyful & Christmas-y! #YouMakeItFeelLikeChristmas #LuckyGirl 💋✨
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 -- '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 couple is still going strong, though.  

"Now here we are, going on three years later, and every day that goes by it just feels like a stronger bond between the two of us and it constantly feels like it's going to the next level," Shelton says. "That's the only way I think either one of us could describe it if she was sitting right here."

The musicians have been especially sweet the last couple of weeks. Stefani celebrated Shelton's birthday over the weekend with dinner at BOA Steakhouse in West Hollywood, California, and a cookout on Father's Day. On Tuesday, Stefani shared snaps from her time with Shelton in his home state of Oklahoma. The couple, along with Stefani's sons — Kingston, 12, Zuma, 9, and Apollo, 4 — spent time on a boat and out in nature.

Despite their obvious love for each other, the duo is in no rush to tie the knot.

"There is no reason for them to rush into a marriage, so they aren’t," a source exclusively told ET back in March. "Both of them are happy and content with where their relationship is right now."

The source continued: "They are on cloud nine for each other. They are perfect for each other. They know they have found their true soulmate."

In April, however, the country superstar admitted to thinking about marrying his longtime love.

"I think about [marrying her]. I don't think it's anytime soon or anything," he said during an interview with CMT. "The more time that goes by, I guess, the closer you'd be getting to that."

18 PHOTOS
Miranda Lambert and Blake Shelton together
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Miranda Lambert and Blake Shelton together
INDIO, CA - APRIL 28: Musicians Blake Shelton and Miranda Lambert perform onstage during the Stagecoach Country Music Festival held at the Empire Polo Field on April 28, 2012 in Indio, California. (Photo by Christopher Polk/Getty Images for Stagecoach)
LAS VEGAS, NV - APRIL 06: Recording artists Blake Shelton (L) and Miranda Lambert attend the 49th Annual Academy of Country Music Awards at the MGM Grand Garden Arena on April 6, 2014 in Las Vegas, Nevada. (Photo by Christopher Polk/ACMA2014/Getty Images for ACM)
LAS VEGAS, NV - APRIL 06: Recording artist Miranda Lambert (R) accepts the Single Record of the Year award for 'Mama's Broken Heart' onstage from co-host Blake Shelton during the 49th Annual Academy of Country Music Awards at the MGM Grand Garden Arena on April 6, 2014 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)
LAS VEGAS, NV - APRIL 07: Musician Blake Shelton and singer Miranda Lambert attend the 48th Annual Academy of Country Music Awards at the MGM Grand Garden Arena on April 7, 2013 in Las Vegas, Nevada. (Photo by Frazer Harrison/ACMA2013/Getty Images for ACM)
LOS ANGELES, CA - FEBRUARY 10: Singers Blake Shelton (L) and Miranda Lambert attend the 55th Annual GRAMMY Awards at STAPLES Center on February 10, 2013 in Los Angeles, California. (Photo by Christopher Polk/Getty Images for NARAS)
NASHVILLE, TN - SEPTEMBER 11: (EXCLUSIVE COVERAGE) Blake Shelton joins his wife Miranda Lambert to Celebrate her No.1 Song 'Mama's Broken Heart' with co writers Kacey Musgraves, Brandy Clark and Shane McAnally at Cabana on September 11, 2013 in Nashville, Tennessee. (Photo by Rick Diamond/Getty Images for BMI)
NASHVILLE, TN - JUNE 04: Miranda Lambert and Blake Shelton attend the 2014 CMT Music awards at the Bridgestone Arena on June 4, 2014 in Nashville, Tennessee. (Photo by Mike Coppola/WireImage)
NASHVILLE, TN - JUNE 13: Singer/Songwriter Blake Shelton is joined by Singer/Sonwriter and Fiancee Miranda Lambert during the 2010 CMA Music Festival on June 13, 2010 in Nashville, Tennessee. (Photo by Rick Diamond/Getty Images)
NASHVILLE, TN - MARCH 15: Grand Ole Opry Member Blake Shelton and Miranda Lambert performs during the 40th Anniversary of The Grand Ole Opry House on March 15, 2014 in Nashville, Tennessee. (Photo by Rick Diamond/Getty Images)
NASHVILLE, TN - JUNE 13: Singer/Songwriter Blake Shelton is joined by Singer/Sonwriter and Fiancee Miranda Lambert during the 2010 CMA Music Festival on June 13, 2010 in Nashville, Tennessee. (Photo by Rick Diamond/Getty Images)
NASHVILLE, TN - JUNE 13: Singer/Songwriter Blake Shelton is joined by Singer/Sonwriter and Fiancee Miranda Lambert during the 2010 CMA Music Festival on June 13, 2010 in Nashville, Tennessee. (Photo by Rick Diamond/Getty Images)
Singers Blake Shelton and Miranda Lambert arrive at The 57th Annual GRAMMY Awards held at the Staples Center. (Photo by Frank Trapper/Corbis via Getty Images)
LOS ANGELES, CA - FEBRUARY 08: Miranda Lambert and Blake Shelton attend The 57th Annual GRAMMY Awards at STAPLES Center on February 8, 2015 in Los Angeles, California. (Photo by Kevin Mazur/WireImage)
NASHVILLE, TN - NOVEMBER 04: Singers Miranda Lambert and Blake Shelton attend the BMI 2014 Country Awards at BMI on November 4, 2014 in Nashville, Tennessee. (Photo by Rick Diamond/Getty Images for BMI)
LAS VEGAS, NV - APRIL 06: Singers Blake Shelton (L) and Miranda Lambert attend the 49th Annual Academy Of Country Music Awards at the MGM Grand Garden Arena on April 6, 2014 in Las Vegas, Nevada. (Photo by Jason Merritt/Getty Images)
LOS ANGELES, CA - JANUARY 26: Miranda Lambert and Blake Shelton arrivals at the 56th GRAMMY Awards on January 26, 2014 in Los Angeles, California. (Photo by Steve Granitz/WireImage)
LOS ANGELES, CA - JANUARY 24: Singers Miranda Lambert and Blake Shelton attend 2014 MusiCares Person Of The Year Honoring Carole King at Los Angeles Convention Center on January 24, 2014 in Los Angeles, California. (Photo by Christopher Polk/Getty Images for NARAS)
NASHVILLE, TN - NOVEMBER 01: Recording artists Miranda Lambert and husband Blake Shelton pose at the 46th annual CMA Awards press room at the Bridgestone Arena on November 1, 2012 in Nashville, Tennessee. (Photo by Jon Kopaloff/FilmMagic)
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