Emotional crescendo on The Voice! 🎤💔 Taylor Swift is moved to tears as the duet with Hello Sunday unfolds, leaving the mentor ‘shattered’ during a powerful rehearsa

Taylor Swift ‘fully fell apart’ watching a duet rehearse during Monday’s episode of The Voice.

The 29-year-old pop star while serving as a ‘mega-mentor’ assisted coach Kelly Clarkson, 37, as they prepared Hello Sunday for a Knockouts Round performance.

Chelsea Glover and Myla Finks, both 14, performed Almost Is Never Enough by Ariana Grande during rehearsal.

Fell apart: Taylor Swift fell apart watching the duet Hello Sunday rehearse during Monday’s episode of The Voice on NBC

Taylor was clearly moved as the girls harmonized and reached soaring notes.

The 10-time Grammy winner recalled in a confessional that she was age 10 or 11 when she started singing for people.

‘But seeing young performers who so firmly have their musical identity figured out. I was so completely shattered by it. I fully fell apart. It was that good,’ Taylor added.

‘Oh my god,’ she said as Hello Sunshine finished their song.

‘You’re 14!,’ Kelly exclaimed after their rendition.

Mega mentor: The 29-year-old pop star while serving as a ‘mega-mentor’ assisted coach Kelly Clarkson, 37, as they prepared Hello Sunday for a Knockouts Round performance

Idol winner: Kelly was impressed by the 14-year-old singers Chelsea Glover and Myla Finks

Emotional reaction: The pop star quickly got emotional watching Hello Sunday sing together

Young singer: The 10-time Grammy winner recalled in a confessional that she was age 10 or 11 when she started singing for people

‘I’m fully crying. I don’t know why. It’s just really, really great. It’s so good,’ Taylor said as she walked over to hug the girls.

Their competition Alex Guthrie, 25, looked worried after they made Taylor cry.

Taylor regained her composure and wiped away her tears as she praised the girls.

Tears flowing: Taylor wiped away tears and said she was ‘fully crying’

Tough competition: Alex Guthrie looked worried after Hello Sunshine made Taylor cry

Big hug: Taylor hugged Hello Sunday after they made her cry

‘I promise I’m okay in my personal life. This is not from some outside place,’ she told them

Alex during the Knockout battle belted out I’m Not The Only One by Sam Smith, but Kelly declared Hello Sunday the winner advancing them to the Live Playoffs.

The singer and songwriter from Georgia after losing gave Hello Sunday a hug and thanked Kelly for her mentorship.

Regaining composure: The pop star regained her composure as she praised the girls

She’s okay: ‘I promise I’m okay in my personal life. This is not from some outside place,’ Taylor told them

Alex was walking off the stage when John Legend, 40, pressed his button at the last moment to steal him.

The two-hour show opened with Gwen Stefani matching Rose Short against Destiny Rayne.

Rose nailed her rendition of Big White Room by Jessie J and beat out Destiny who sang Tell Me You Love Me by Demi Lovato.

Knockout round: Hello Sunday also delivered during their Knockouts Round performance

Tough call: Alex Guthrie was told by Kelly that Hello Sunday won the round

The steal: The Voice host Carson Daly stood next to Alex before he was stolen

Last steal: John Legend used his last steal to get Alex on his team

Kelly next paired Shane Q against Kiara Brown.

Shane performed In Case You Didn’t Know, while Kiara took on The Bones.

Kelly named Shane the winner and admitted it was hard to see Kiara go home.

First up: The two-hour show opened with Gwen Stefani matching Rose Short against Destiny Rayne

Live playoffs: Rose nailed her rendition of Big White Room by Jessie J and beat out Destiny who sang Tell Me You Love Me by Demi Lovato

Moving forward: Shane Q also advanced after he beat out Kiara Brown

Blake Shelton, 43, pitted Kat Hammock against Lauren Hall.

Kat, 18, sang Kiss Me by Sixpence None The Richer while Lauren, 25, took on Kelly’s song Breakaway.

Blake who admitted he was in love with Kat’s voice since day one named her the winner.

Talented singers: Blake Shelton, 43, pitted Kat Hammock, 18, against Lauren Hall, 25

Teen talent: Kat was named the winner by country star Blake

John put Will Breman up against Zoe Upkins and their performances impressed the judges.

‘I don’t know why you put them together, that was dumb,’ Kelly teased John.

John stalled while making his decision and heaped heavy praise on both singers.

Energetic rendition: John put Will Breman up against Zoe Upkins and he delivered an energetic rendition of I Don’t Care by Ed Sheeran and Justin Bieber

He eventually named Will the winner after his energetic rendition of I Don’t Care by Ed Sheeran and Justin Bieber.

Gwen Stefani, 50, also matched Jake HaldenVang against Royce Lovett.

The No Doubt singer named Jake the winner after he performed Powerful by Major Lazer sending him to the Live Playoffs.

The Voice will return Tuesday on NBC as the Knockout Rounds conclude.

The winner: Will was named the winner over Zoe and advanced to the live playoffs

Stylish star: Gwen Stefani, 50, also matched Jake HaldenVang against Royce Lovett