Nick Jonas has revealed that a "really tragic" onstage performance led him to seek therapy.
The blunder at the Academy of Country Music Awards in 2016 took place as the Jonas brother joined country pop singer Kelsea Ballerini during a performance of her single Peter Pan.
Jonas had gone off-key during his guitar solo.
Speaking on the Armchair Expert with Dax Shepard podcast, the Jealous singer said what started off "fine" slowly turned "tragic".
"As I walked towards her, I just went completely blank and I hit a wrong note and blacked out basically and clocked that it was wrong and I couldn’t stop," the 30-year-old singer said.
"In retrospect, I can kind of laugh about how big I thought it was.
"But it did travel more than I wish it would have, and it did cause me to go to therapy."
'I think that was bad'
The Jonas brother said he could not "figure out exactly what happened" and recalled being rushed away after the show.
"Until this day and hours after unpacking it, I can’t really figure out exactly what happened, but I was rushed to a car and rushed to a plane right after it," Jonas added.
"And I looked at my manager and said, 'I think that was bad'. I was like in shock kinda.
"Like it was a really traumatic moment that shaped the pressure I put on myself to be perfect and to always be on."
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The singer said he has since tried to heal from the incident, which he called "the worst moment".
At the time, the performance made headlines with many outlets branding it a "fail".
The Jonas Brothers are back
The comments come as the group looks ahead to heading on tour this year across the US after releasing their sixth studio record - The Album.
The Jonas Brothers - made up of Joe, Kevin and Nick Jonas - had reunited in 2019 after disbanding and taking a break in 2013.
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Earlier this month, Nick said the band were putting themselves in new positions so they can feel "butterflies and excitement" before kicking off the tour at New York's Yankee Stadium in August.
"It's our favourite baseball team's stadium for our entire lives," he said.
"We got to go and kind of go to a game and meet some of the players about a month ago.
"And we were just looking around, thinking the 10-year-old version of us that was sitting up in the highest nosebleed section seat would not believe that we're going to play this place twice."