Inside Blake Shelton's sweet relationship with Gwen Stefani's sons (Exclusive)

Blake Shelton has a close relationship with Gwen Stefani's sons.

A source tells ET that the 43-year-old country singer loves spending time with his girlfriend's three sons -- Kingston, 13, Zuma, 10, and Apollo, 6 -- who she shares with her ex-husband, Gavin Rossdale.

"Gwen and Blake do so many fun activities with the boys and Blake plays with them like a big kid," the source says. "He seriously enjoys doing things with the kids like going to the movies, fishing, camping, and teaching them to horseback ride and boating."

"They are both working so much and are loving their life as a family," the source adds of the couple. "Blake has made Gwen's boys a huge priority in his life and cares for them like their his own."

While their relationship, which has been going strong since 2015, is in a great place, the source says that Stefani and Shelton are not eager to jump into a marriage just yet.

"Blake and Gwen are head over heels in love, but don't want to feel rushed to tie the knot when everything is going so well in both of their lives," the source says. "Everyone is asking what they are waiting for, but they really just don’t want to rock the boat."

60 PHOTOS
Blake Shelton and Gwen Stefani together
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Blake Shelton and Gwen Stefani together
BURBANK, CALIFORNIA - AUGUST 13: (EDITORS NOTE: Retransmission with alternate crop.) (L-R) Gwen Stefani and Blake Shelton attend "Bennett's War" Los Angeles Premiere at Warner Bros. Studios on August 13, 2019 in Burbank, California. (Photo by Joshua Blanchard/Getty Images for Forrest Film)
BURBANK, CALIFORNIA - AUGUST 13: (L-R) Gwen Stefani, Blake Shelton, Trace Adkins, and Victoria Pratt attend "Bennett's War" Los Angeles Premiere at Warner Bros. Studios on August 13, 2019 in Burbank, California. (Photo by Joshua Blanchard/Getty Images for Forrest Film)
LOS ANGELES, CALIFORNIA - APRIL 27: (L-R) Kingston Rossdale, Apollo Bowie Flynn Rossdale, Blake Shelton, and Gwen Stefani attend STX Films World Premiere of "UglyDolls" at Regal Cinemas L.A. Live on April 27, 2019 in Los Angeles, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
LOS ANGELES, CALIFORNIA - APRIL 27: Blake Shelton, Gwen Stefani and Janelle Monae attend the after party for the STX films world premiere of "Ugly Dolls" at Regal Cinemas L.A. Live on April 27, 2019 in Los Angeles, California. (Photo by Emma McIntyre/Getty Images)
LOS ANGELES, CALIFORNIA - APRIL 27: Gwen Stefani and Blake Shelton arrive at the STX Films World Premiere Of "UglyDolls" at Regal Cinemas L.A. Live on April 27, 2019 in Los Angeles, California. (Photo by Steve Granitz/WireImage)
LAS VEGAS, NEVADA - APRIL 07: (L-R) Blake Shelton and Gwen Stefani during the 54th Academy Of Country Music Awards at MGM Grand Garden Arena on April 07, 2019 in Las Vegas, Nevada. (Photo by Jeff Kravitz/ACMA2019/FilmMagic for ACM )
LAS VEGAS, NEVADA - APRIL 07: (L-R) Blake Shelton and Gwen Stefani pose in the audience during the 54th Academy Of Country Music Awards at MGM Grand Garden Arena on April 07, 2019 in Las Vegas, Nevada. (Photo by John Shearer/ACMA2019/Getty Images for ACM)
LAS VEGAS, NEVADA - APRIL 07: (L-R) Blake Shelton and Gwen Stefani during the 54th Academy Of Country Music Awards at MGM Grand Garden Arena on April 07, 2019 in Las Vegas, Nevada. (Photo by Jeff Kravitz/ACMA2019/FilmMagic for ACM )
SANTA MONICA, CA - NOVEMBER 11: 2018 E! PEOPLE'S CHOICE AWARDS -- Pictured: (l-r) Blake Shelton, Gwen Stefani, Mae Whitman and Christina Hendricks pose during the 2018 E! People's Choice Awards held at the Barker Hangar on November 11, 2018 -- NUP_185072 -- (Photo by Christopher Polk/E! Entertainment/NBCU Photo Bank via Getty Images)
SANTA MONICA, CA - NOVEMBER 11: 2018 E! PEOPLE'S CHOICE AWARDS -- Pictured: (l-r) Gwen Stefani and Blake Shelton backstage during the 2018 E! People's Choice Awards held at the Barker Hangar on November 11, 2018 -- NUP_185073 -- (Photo by Todd Williamson/E! Entertainment/NBCU Photo Bank via Getty Images)
SANTA MONICA, CA - NOVEMBER 11: 2018 E! PEOPLE'S CHOICE AWARDS -- Pictured: (l-r) Carson Daly, Siri Pinter, Gwen Stefani and Blake Shelton pose with their awards for Competition Show of 2018 for' The Voice' backstage during the 2018 E! People's Choice Awards held at the Barker Hangar on November 11, 2018 -- NUP_185073 -- (Photo by Todd Williamson/E! Entertainment/NBCU Photo Bank via Getty Images)
SANTA MONICA, CA - NOVEMBER 11: 2018 E! PEOPLE'S CHOICE AWARDS -- Pictured: (l-r) Carson Daly, Gwen Stefani and Blake Shelton on stage during the 2018 E! People's Choice Awards held at the Barker Hangar on November 11, 2018 -- NUP_185094 -- (Photo by Alberto Rodriguez/E! Entertainment/NBCU Photo Bank via Getty Images)
❤️🙏🏻 #vegas #justagirl @blakeshelton gx #picsbysophiemuller
LAS VEGAS, NV - JUNE 28: Singer Gwen Stefani (L) and recording artist Blake Shelton attend the grand opening of her 'Gwen Stefani - Just a Girl' residency at Planet Hollywood Resort & Casino on June 28, 2018 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)
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 - 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)
LOS ANGELES, CALIFORNIA - APRIL 27: (L-R) Kingston Rossdale, Gwen Stefani, Blake Shelton, Apollo Bowie Flynn Rossdale, and Zuma Nesta Rock Rossdale arrive at the STX Films World Premiere Of "UglyDolls" at Regal Cinemas L.A. Live on April 27, 2019 in Los Angeles, California. (Photo by Steve Granitz/WireImage)
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When ET caught up with Shelton back in June, he revealed how he and Stefani will share the news when they do eventually decide to tie the knot.

"I gotta say that we couldn't be happier, and we've never been doing better," he said at the time. "... I promise you, we won't break the news in any of the grocery store trash magazines."

Another way Stefani and Shelton are thriving right now is through their work as coaches on The Voice ahead of the premiere of the upcoming 17th season. The duo previously worked side by side as coaches on the NBC competition series together during seasons seven, nine and 12. Additionally, Stefani served as a part-time adviser on the show for its eighth and 10th seasons.

"While filming The Voice, they've had the best time," ET's source says. "They’re playful, flirty, and laugh nonstop."

"Gwen seems secure and happy to be back. Gwen has wanted to return to the show for some time, and was in discussions with The Voice, but it didn’t happen immediately. So when she finally signed the deal, she was thrilled," the source continues. "Blake really pushed to have Gwen back after Adam [Levine] revealed he was leaving."

The source also notes that "Blake loves working with Gwen because it really gives them time to be together."

"Blake and Gwen are better than ever," the source shares. "They adore each other. Working together is truly an ideal situation for them."

12 PHOTOS
Gwen Stefani and Blake Shelton at the White House state dinner
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Gwen Stefani and Blake Shelton at the White House state dinner
Singers Gwen Stefani and Blake Shelton attend the State Dinner for Italian Prime Minister Matteo Renzi at the White House in Washington on October 18, 2016. / AFP / YURI GRIPAS (Photo credit should read YURI GRIPAS/AFP/Getty Images)
Singer Gwen Stefani performs during the State Dinner for Italian Prime Minister Matteo Renzi at the White House in Washington on October 18, 2016. / AFP / YURI GRIPAS (Photo credit should read YURI GRIPAS/AFP/Getty Images)
Singer Gwen Stefani performs during the State Dinner for Italian Prime Minister Matteo Renzi at the White House in Washington on October 18, 2016. / AFP / YURI GRIPAS (Photo credit should read YURI GRIPAS/AFP/Getty Images)
Singers Gwen Stefani and Blake Shelton attend the State Dinner for Italian Prime Minister Matteo Renzi at the White House in Washington on October 18, 2016. / AFP / YURI GRIPAS (Photo credit should read YURI GRIPAS/AFP/Getty Images)
Singer Gwen Stefani performs during the State Dinner for Italian Prime Minister Matteo Renzi at the White House in Washington on October 18, 2016. / AFP / YURI GRIPAS (Photo credit should read YURI GRIPAS/AFP/Getty Images)
WASHINGTON, DC - OCTOBER 18: U.S. entertainers Gwen Stefani and Blake Shelton (C) and New York Gov, Andrew Cuomo attend a state dinner for Italian Prime Minister Matteo Renzi, hosted by President Barack Obama on the South Lawn of the White House October 18, 2016 in Washington DC. The president and first lady Michelle Obama will tonight host their final state dinner, with singer Gwen Stefani performing. (Photo by Michael Reynolds-Pool/Getty Images)
WASHINGTON, DC - OCTOBER 18: U.S. entertainer Gwen Stefani attends a state dinner for Italian Prime Minister Matteo Renzi, hosted by President Barack Obama on the South Lawn of the White House October 18, 2016 in Washington DC. The president and first lady Michelle Obama will tonight host their final state dinner, with singer Gwen Stefani performing. (Photo by Michael Reynolds-Pool/Getty Images)
Singers Gwen Stefani and Blake Shelton attend the State Dinner for Italian Prime Minister Matteo Renzi at the White House in Washington on October 18, 2016. / AFP / YURI GRIPAS (Photo credit should read YURI GRIPAS/AFP/Getty Images)
Singers Gwen Stefani and Blake Shelton attend the State Dinner for Italian Prime Minister Matteo Renzi at the White House in Washington on October 18, 2016. / AFP / YURI GRIPAS (Photo credit should read YURI GRIPAS/AFP/Getty Images)
WASHINGTON, DC - OCTOBER 18: U.S. entertainer Gwen Stefani performs at a state dinner for Italian Prime Minister Matteo Renzi, hosted by President Barack Obama on the South Lawn of the White House October 18, 2016 in Washington DC. The president and first lady Michelle Obama will tonight host their final state dinner. (Photo by Michael Reynolds-Pool/Getty Images)
WASHINGTON, DC - OCTOBER 18: U.S. entertainer Gwen Stefani performs at a state dinner for Italian Prime Minister Matteo Renzi, hosted by President Barack Obama on the South Lawn of the White House October 18, 2016 in Washington DC. The president and first lady Michelle Obama will tonight host their final state dinner. (Photo by Michael Reynolds-Pool/Getty Images)
WASHINGTON, DC - OCTOBER 18: U.S. entertainer Gwen Stefani performs at a state dinner for Italian Prime Minister Matteo Renzi, hosted by President Barack Obama on the South Lawn of the White House October 18, 2016 in Washington DC. The president and first lady Michelle Obama will tonight host their final state dinner. (Photo by Michael Reynolds-Pool/Getty Images)
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